Hmm, I agree with most of this, but I think my main point of contention would be that Mikey's willingness to let people go is pretty dependent on whether or not someone's there to push him into accepting that they want to leave.
Draken and Mikey's conflict during the Moebius Arc is largely centered around the fact that Mikey doesn't want to accept the fact that Pah turned himself in for stabbing Osanai, and it takes Takemichi yelling at both of them for Mikey to respect the fact. And even then, the major motivator behind why Mikey put Kisaki into a formal position of power within Toman so fast was that Kisaki promised him that he could get Pah out of prison in exchange for the 3rd Division Captain position. Something which Mitsuya, Draken, and Baji were initially all against, but ultimately 2/3 of them relented.
Baji's dialogue when he announces his departure from Toman implies that Baji had been actively trying to get himself fired and that his coming to a meeting he was banned from and attacking Takemichi wasn't his first attempt at getting kicked out. And even when Baji quits regardless, Mikey does demand that Takemichi bring him back to Toman, and the goal of dragging Baji back into Toman is a big part of why they accepted Valhalla's provocations, despite Mikey admitting they don't really have anything to gain from fighting Valhalla. Although in this case I think you could probably make an argument that his unwillingness to let Baji go is intrinsically tied to his anger over the fact that he felt like Baji was taking Kazutora's side. (The fact Mikey says he's forgiven Baji for his role in what happened to Shinichiro but that he can't forgive him for 'siding with Kazutora' does put his behavior towards Baji in an interesting light imo, but I don't have a lot of articulate thoughts about it.)
It takes Draken and Mitsuya imploring him to the point of getting on their knees for him to let Takemichi go in the Manila timeline.
So, while he most definitely has more respect for people's autonomy than Kazutora does, I do think his base instinct is to try and keep them around until actively pushed into letting them go.
This one I had to sit with for a while, but I'm also not entirely sure Kazutora's the best example to use for Mikey actively trying to avoid conflict with his loved ones. Largely because, well...Mikey did plan on killing him as soon as he got out of juvie, and according to Mikey, the reason he didn't go through with it was Baji repeatedly trying to explain what was going on inside Kazutora's head to him. Now, I do think that that's not the entire truth, because I think even throughout this entire mess there was still a part of Mikey that considered Kazutora his and cared about him — I doubt Mikey would have testified on Kazutora's behalf if there had been an immediate loss of love between them. But for me, while it may be a bit pedantic, Mikey questioning why Kazutora thinks Mikey is his enemy reads less like Mikey trying to avoid conflict and more like him trying to decide why he should. If he can't square the reasoning Baji gave him with what Kazutora actually says, then why shouldn't he forsake whatever love he still has for the other boy?
This all kind of ties into what the major difference in how Mikey and Kazutora deal with things with regard to loss/abandonment I was thinking about when I wrote the original post. When I think about it, I always come back to Mikey's flashbacks during the final arc where it's shown that his goal to make Toman the largest gang in Japan is tied to how he (doesn't) cope with Shinichiro's death. Initially, he thought to achieve his dreams of a new era he just needed to have the strongest guys he knew around, but after Shinichiro died it morphed into the need to create a gang so large it could reach his brother.
I.e. where Kazutora's solution was to drive other people out and adopt an extremely rigid worldview and moral system that he refused to be challenged on, Mikey's, at least up until the point where he fully internalized the idea that everything bad that's ever happened was his own fault, was to try and fill the void/fix his listlessness by surrounding himself with other people and relying on them to guide him in navigating things.
As an aside, going back to the topic of animal motifs from your other post, I think it's kind of neat that Mikey sometimes gets associated with lions, which are a communal species. While Kazutora's a tiger, which are solitary animals (also, it's funny that the three characters most strongly tied to Baji in the series - Mikey, Kazutora, Chifuyu - are all associated with cats.)