It's honestly hard to say why Traore's 2FG% is low, because we can't watch the games. My impression from what I can watch is that he takes a lot of non restricted area 2s as a shot that is designed within their offense (if not designed, at least very acceptable). Traore beats his primary defender as good or better than Fear, in my opinion, but he is much more likely to use that advantage to then create for someone else. If you are going to completely ignore the obvious advantage that Troare has as a play maker over Fears, then I can see why you would think there is a solid advantage to Fears.
Whenever a player's 2FG% is low, it's almost always a result of shooting a bunch of non rim 2's. Maybe I'd get a different impression watching the full games, but to me that's a symptom of not getting all the way to the rim and I don't buy that it's by design. While I'd agree that Traore is a better playmaker and chooses to pass more, I'd also say that Fears is just way better at getting to the basket and also chooses to do so because he can. I think it's crucial to be a scoring threat to become an offensive engine in the NBA, I don't worry about Fear's ability to put pressure on the rim, but I do have concerns with Traore doing the same. IMO, this skill is of the same priority as three point shooting.
There blow by speed might be the same, but I think Fears has that extra element that allows him to turn more drives into more shots at the rim and FT's. It's what I think is Fears biggest strength....even when there's a man in between him in the hoop he can turn it into a rim shot attempt or FT's. He is very crafty and aggressive.