I agree but Harris is a better defender, younger (I think), and much more efficient offensively.
I'd also add that money is drying up and not a ton of teams will be able to spend on outside fa's next summer.
We could offer him now but I think it could be prudent to let the season play out, see how Mitchell performs, and go from there.
Why offer Hood 4/75 now if Mitchell becomes an obvious starter at the 2? If no one wants to or really has the money to offer him that? Given his injury history? Yes, we have to worry about him blowing up but if that happens, it makes re-signing him (at a higher cost) that much more of an obvious move.