I don't think it's easy to justify a tier gap between a lot of things in FE4 at all, especially not multiple of them. While I can't say the crew is balanced, it's usually between mount, Pursuit, availability, and offense/defense parameters. The only guy who is really good at all of those for all game long is Sigurd. Even Lex has issues before Hero Axe.
So I'd like to simplify the list to:
Top
High
Mid
Low
That seems a bit asymmetric until you realize that the only character I intend to be in Top is Sigurd. I think this also makes it easier to add up things. In theory, a character starts in Low. Lots of availability? Push up one tier. Mount? Push up another. Excel in combat? Up another. Of course this can't all be weighed equally.
So I'd like to simplify the list to:
Top
High
Mid
Low
That seems a bit asymmetric until you realize that the only character I intend to be in Top is Sigurd. I think this also makes it easier to add up things. In theory, a character starts in Low. Lots of availability? Push up one tier. Mount? Push up another. Excel in combat? Up another. Of course this can't all be weighed equally.