B grade talent is guys who can play at a grade level just not consitent. You're talking about role players which Carlton also lackB-grade talent is just C-grade and D-grade talent in a good system. If Voss brings a good system, there's no reason a lot of the players at Carlton can't fill a role the system that haven't previously looked fantastic.
A-graders will be A-graders anywhere, it's the rest of the team that looks good when the system is good.
It's not like guys like Castagna or Lambert would still look like great players in a shitty system, despite being triple Premiership players.
You'd expect most of the players taken inside the first 2 rounds of the draft to be B or C grade guys, the kind of region where you get your 100 gamers from. Motlop, Durdin, Caroll, Kemp, and Philp have all barely played yet were taken inside that range over the last 3 years. I'd expect at least some of them to be capable of being B-graders in a good system unless a clubs drafting and talent ID is appallingly bad (which it was in the 2014 draft under Shane Rogers who then got turfed out).