Kellen Moore expected to be Saints coach

I can't help but wonder about A.T. Perry. Part of me wonders if he's another talent we let go that could've become something special. But he's on the Broncos practice squad and its excessively rare that great talent sits on a practice squad. Especially when Payton himself is known for using walk-ons and putting them in position to excel if they have a specific skill set he can use.
This place has a weird woody for AT Perry. He can't crack the Broncos active roster, and is behind the depth chart to former Saint lil' Jordan Humpheries, who a lot of the same posters that love Perry so much, criticized. He also is behind 27 year old rookie Devaugh Vele, a 7th round pick.

If AT Perry is so great, why is he still on a practice squad?