Collins is the backfill for 1tech. It doesn't have to go to the 4th dt. They don't need more 1tech backup after that, and they prefer 3techs besides. Assuming no injuries, 1tech is covered without Covington. His flexibility makes him nice insurance against injury to others, but you're hoping you don't need that insurance.
For what it's worth, PFF graded Ross above average, and Covington a little higher. Maliek graded out the worst, even lower than Hyder. Ross is going to get every chance to be the younger, cheaper 3tech backup next year with Crawford and Collins gone.
Good point about Gregory creating a bubble spot in the case of a suspension. People won't like hearing it, but a short suspension at the beginning of the season has the advantage of letting you keep the rights to more players through final cuts.
Possible on Crawford, if everyone else pans out. Hyder can be our cheaper tweener this year, more like a Jack Crawford. Ross gives you more to cut Crawford than Covington, from a position perspective.