In the scenario where Lloyd gets taken and when Garmadon finds him and busts through the metal wall screaming GIVE ME THE CHILD in his Oni form:
What would he do upon finding the others? Adopt them? Leave them? Return them to their parents?
My Garmadon makes choices that are a little different than the classic dude. Since this au takes place years prior to the events of the show, the snake's venom hasn't completely taken over Garmadon's system yet. (I mean, he was still kinda good even then if you ask me but uh :/)
Garmadon would be surprised at finding the others, only barely grasping what exactly the Golden Order have been up to.
The boys would probably be a little wary at first, but hey, if L5 trusts the freaky red eyed dude with four arms, they should trust him too, right?
Garmadon may try to leave at first, to drop Lloyd off at a safe location before coming back for the other four.
However, considering that this is the alternate timeline where Lloyd is taken as well, L5-En would REFUSE to leave his brothers, kicking and screaming depending on how far Garmadon manages to go before unavoidably turning around. (For the record, he doesn't go far at all. Doesn't even leave the compound.)
And no matter how much Garmadon tries to convince himself that there's no hope for him, that he's rotten to the core and deserves damnation, he could never leave four innocent children at the mercy of monsters. He just couldn't.
So Garmadon would take the four with him.
Not knowing who the four belong to, Garmadon would go to Wu for help, against his better judgement. (oh boy the look on Wu's face when he opens the door to find his long lost brother with Lloyd and four young children hehe)
Anyways, hope this answers your question! And sorry this took so long to respond to, I've been a tad busy lately.