Personally I think you can get Soliai for around Mitchell's # and I'd do it. If you can't you look elsewhere for a plugger. It's a move I'd be happy with, but I also don't get the sense Mitchell is going anywhere.
My sentiment is they like Mitchell's pass rushing ability. Vance Joseph doesn't blitz with regularity and relies heavily on the DL front to create pressure in the passing game. It's my belief that Coyle's run vs pass calls were a detriment to our run defense where in a one gap scheme you can be exploited by making the wrong call according to down & distance, or time remaining.