Arbogast's preimeter defense is rated as B+, with B potential. I'll take that, wouldn't be suprised to see a jump come TC.
I've probably said this 1000 times but I'll do so once more.
individual category potentials don't carry over to FBB. Only one potential does, so they all get combined. If a guy has an A potential in perimeter defense in FBCB and an F inside scoring potential in FBCB, when he gets into the pro's he's just as likely to improve his inside scoring as he is his perimeter defense.