in Ellis and Manny, one below average one in Harbison, one bad one in Torbush, and to be fair I'll say the jury is still out on Wilson.
Honestly, I'd have to say very little. The guys you mentioned weren't exactly four-five star guys that were expected to be big contributors other than Mitchell- and he has contributed over the course of his career.
Then changes didn't affect guys like Pernell, Chris White, KJ Wright, and it hasn't affected Fletcher Cox and Josh Boyd.
No doubt it would be good to have someone good for a longer period of time, though.