Along the other things mentioned here, this year felt like a year where a lot of teams didn't need a QB. And a bigger issue is that they especially don't need a backup or practice team one either.
It was brought up a lot this past season with the Philip Rivers signing and the discussions surrounding the decline in the development of QBs, but the backup QB market really isn't in a good place right now. A lot of guys don't feel like quality candidates, and a lot of them are just floating around the league.
A lot of these college QBs aren't even going to get a serious shot at a backup or practice squad role the way they used to a decade or so ago. Those are going to guys who already have a little bit more experience or have been around the NFL for a longer period of time They especially aren't going to give it to a guy like Diego who already had a uphill battle to climb as a potential prospect.
This Baltimore Ravens camp invitation will probably be the maximum of his involvement with the NFL.