Originally Posted by fate

I don't think getting the girl to level 70 would change the algorithm in anyway.
Beside, what is B;A;S-Tier 6*?

Level shouldn't affect Passive Ability calculations.

There's apparently a tier list for the 6*s on DMM's boards. I think most of ours are B tier. Honestly though, any 6* is pretty damn effective and you don't need to go beyond 4*s to clear maps (obviously it gets easier with 5 and 6*s in the team)