TBH aside from the Splatoon archer, the 14th lineup is pretty bad. There's only 1 or 2 4* chars that are actually good or worth starting with. If you can get a 4* from the 7 Deadly Sins REM, then it might be worth just going ahead and starting. If you roll a 4* caster, you should probably start as well (because the easiest way to get cockblocked in this game is not having a healer). I'd say that your starting roll matters not so much in this game, given how much free stones they give out all the time. It's almost just as important to just get into the game ASAP so you have the ability to collect all the stuff they're giving out.