#bsd chapter 65

Personally, I think it’s most likely to be Tanizaki because Hirotsu straight-up thought to himself that light snow is perfect for assassination and we’ve seen how far he is willing to go as long as it means keeping Naomi safe. Also in terms of what his ability can do (limitation wise), we know that he can create convincingly real and solid projections (which Mori himself has witnessed) and the only weakness so far has been using heat sensors. Also, although the decision is basically Mori’s to make, Tanizaki did try to offer himself up in place of Yosano, already aware that his ability will be useful to the PM and before having even asked Yosano about her past and why she was so against joining in ch 65.

Ch 48, p 18, translation by dazaiscans

Ch 30, p 24, translation by dazaiscans

Ch 51, p 8, translation by dazaiscans

Ch 65, p 15, translation by dazaiscans

Yosano and Dazai would be way too against going back for it to be worth trying in my opinion. Also, Dazai has hinted that Mori is scared of him because Mori taught him just about everything he knows, so he knows very well what Dazai’s true potential is in terms of cruelty. I know Mori has asked for Yosano when explaining the agreement, but I honestly do think that he did it to manipulate and mess with her, possibly to partly anger and get back at Fukuzawa for taking her away from him all those years ago.

Ch 30, p 26, translation by dazaiscans

Also if he asks for Naomi instead then Tanizaki will join too or we’d get a beast situation (use Naomi as a sort bargaining chip to get Tanizaki and possibly the rest of the ADA to do exactly as Mori wants). Because when Hirotsu did mention Naomi in ch 48/ep 34, that’s what angered Tanizaki and had him prepared to kill the Black Lizard members that were in the room. It would be a more roundabout method but it would get Tanizaki to follow for sure and can also be used to manipulate the rest of the ADA since they do all care about each other.

I doubt he’d ask for Kyouka back but I wouldn’t entirely eliminate the possibility. Kouyou would also most likely go against this decision since she’s seen that Kyouka very much does have a spot living in the light and allies that would protect/back her up.

There’s also the chance of asking for Atsushi because of his raw strength. Yeah, he’s not in the same type of spot of vulnerability as at the beginning of the story so less room for manipulation due to his growth. Also, it's pretty much just Mori left that would be manipulative but in that case, maybe Kouyou would try to protect him and assign Chuuya to look out for him, assuming Mori does ask for Atsushi. The argument of asking for Atsushi for the sake of having both halves of SSKK is in a sort of limbo as of ch 93 (when writing/posting this) because although we now know that Akutagawa can still use Rashoumon, we don’t know yet how if and how Akutagawa can regain control of himself (aside from Mori getting ahold of Bram), which would make joint missions for SSKK difficult for now.

Also just making sure I have all of the ADA members covered:

Ranpo would call everyone stupid and they already have to deal with Elise’s antics + plus he’s cut out for almost only detective work, though he’d be really good at strategizing. However, Mori is already there and the way of thinking and strategizing preferred within the mafia aligns more with Dazai’s strategies, since Dazai was trained with that intent in mind

Kenji tends to just go with the flow (he legit just went with the majority in the cannibalism arc, and didn’t really have his own opinion on what to do) which can backfire but I think it’d be very interesting if he was chosen. Also due to both his willingness to pretty much go with the flow and deal with things as they come as well as being younger, it would certainly be easier for Mori to manipulate him. Honestly, I would even go as far as to say that there’s a fair enough chance of Kenji being chosen. Also, we’ve seen how unphased Kenji is by all the violence and brutality he’s encountered throughout the main story.

Ch 48.5, p 10, translation by dazaiscans

Kunikida would never give up his ideals to that extent if he could do something about it. He does resort to violence (to the point of Dazai reminding him that Fukuzawa has told him to control himself more in ch 1/ep 1) but it’s more when it’s a necessity (you can see a bit more of my analysis on this here) that he would resort to it.

Ch 1, p 24, translation by Shoujo Sense

I very much doubt he’d ask for Fukuzawa cause Mori and him are basically rivals but it’s also not impossible considering that in his bodyguard days he did work for/with Mori, even if he didn’t like it. Sure Fukuzawa may be the one in charge of the ADA but it’s already been addressed on multiple occasions as to who would be in charge should anything happen to Fukuzawa (both in Walking Alone and the Cannibalism arc).

Ch 40, p 42, translation by dazaiscans

I doubt Mori would ask for Katai because he is a former member, but Mori also didn’t specify that it had to be a current member of the ADA. Higuchi was witnessed his ability in action first hand after all. However, looking at the illustration from when Mori first proposed the question again, the ones pictured are Yosano, Kunikida, Ranpo, Atsushi, Dazai, Kyouka, Kenji, and Tanizaki. Plus, Katai really does not like the PM and needs to be comfortable and focused to use his ability so would he even be willing to work if he was chosen?

Ch 65, p 7, translation by dazaiscans

Considering this is also Mori we're talking about, his decision has to be one founded in logic. So in conclusion, I personally think Tanizaki or Kenji are most likely to be chosen. Although the rest of the ADA is bound to hear of the plan soon enough, I'd say there's a fair chance that there was a point in Kenji and Tanizaki being in the room too when telling Yosano of the plan, who he likely partly wanted to mess with as well in giving this info. Also, Mori was the one to get them from hiding, so there could be some significance to that, but who knows for now.