I'm dumbstruck by your statements. As a veteran poster, you should know what YAC and that it has nothing to do with where he catches the ball. And your statement about a 50 yard bomb is just silly..
YAC as a percentage of receiving yards absolutely has to do with where he catches the ball. If he's catching a significant percentage of around the LOS, that should cause the ratio to rise dramatically.
Basically, the biggest extrapolation you can take from that stat is that a) he gets a lot of yards after catch, and b) nobody's asking him to make plays like this:
New England Patriots running back Shane Vereen 50-yard catch
or like this:
Wk 7 Can't-Miss Play: Vereen 49-yard TD
It's impossible to get anywhere near 93% of receiving yards as YAC if you're making catches like that. Not a knock on White, he's doing what they're asking of him and he's doing it well. He doesn't have Vereen's versatility as a receiver, but that's fine. He's plenty effective being the player he is.
But there's another side to this coin, too: nobody should ever hold it against Vereen that he *did* make catches like that. His ratio was lower since he frequently lined up as a WR and ran WR routes, and by no reasonable standard should that ever be a knock on him.That's what the Pats asked him to do, and it's what he did.
They're both pass-catching backs, but they are a bit different in that respect. White is more of a traditional 3DRB, whereas Vereen was more of a RB/WR hybrid.
Think of it this way: if a WR catches 90% of his passes within 5 yards of the LOS, that doesn't mean he's better at catching quick passes than someone who 'only' catches 60% of passes in that range. It could mean that, or it could mean the other guy is more versatile, or it could mean the teams around them are different and therefore they're being asked to do different things.