I think if the mc gets treated well in 6th unit then he should switch but thinking about his masochist's personality he will probably refuse. i mean won't you want to work in a unit where you don't have to do every fucking thing yourself? mc does everything himself, all the housekeeping chores he gets none of the help from other members except the loli who help him whenever she can, Yotsuba is a mess who can't even keep her own room clean and mc has to keep her room clean so i doubt she helps mc in doing any of the house chores even though she was told by chief but she is more kinda girl who treats you like a total slave by blackmailing you which is exactly what she is doing. im not expecting tsundere girl to be of any help as well, she came out bitchy at the start and has only now softened up to him, and we know mc is the only one who does all the house chores. And on top of that, they take him to fights and expect him to give his all there as well. that's a shit working environment, one would definitely switch if one were to receive a better option.