I you want to level them all efficiently you have to level a dps and tank with them.
Otherwise here's some tips with trusts:
-Always pair Rhyne with Thancred. He won't do the cartridge combo without her.
-Thancred is also like 10x more tanky than WoLs. He has damage down that he inflicts in aoe around him from time to time ontop of his own regen.
-Never use both Twins at once. Alphi will always prioritize Alis over everything else no matter what.
-Y'shtola actually casts her spells in a set order and not a 100% random fashion. Also her foul makes all BLMs jelly at how it chunks bosses.
