Not knowing what the other distro settings are, it's hard to say, but I'm going to speculate it might be due to others on the team having higher distro numbers (your PG, for instance, looks like he has a very high distro number) so the ratio might still be keeping him down compared to others who are on the floor at the same time as him (although if he was at a 13, that seems high enough that it might not be the reason...)
I also think his Ath-Spd have something to do with it, especially in the game where he was going against a man defense. Neither of those numbers are stellar, so against good defenders/more athletic or faster players, it might be tough for him to "get free" to take shots, regardless of the distro number.