Assuming we need 7 core people for the B team, right? And this is not including people rejected from the A team, either.
Everyone has good things to say about Jolteon, I personally haven't played him since his massive improvement but his placement at GT3 and his relatively unique character main gives him a fairly safe place on the B team.
I don't know whether Kone would be playing Peach of Samus in crews. I think a Peach is crucial on the team, to be honest, preferrably one who can deal with Falcos (barring Fox[?] I think this is the best Falco matchup, not sure about other people). His place is fairly safe but moreso if he's playing Peach. Do we have any other solid Peach players?
Coey is on the B team (if not the A team...). Never played him but have seen videos. Plus he places well (similar/better to J03), and he plays luigi, :D Good spacey counter is invaluable.
So, 4 places left. And that's not including people rejected from the A team (although gantz isn't coming now, so this might not be such a problem). And the foxes or falcos haven't even been considered yet.
Do we want a falcon in the team, as well? Even if we have 1 of each that's only 1 place left. And BBill is a solid player (don't know what matchups he prefers though? Enlighten me Ben). And a Marth might be helpful (don't know how good blinky's marth is, however).
The only character we should even consider having duplicates of is Fox. So neither Deathgazer and Unreal can be in the team, practically (same applies to me and The Lust). We don't even have to include Falcon or Falco either (opinions on this!).