no, because of the fact that Andra has made most of the defensive calls in the OTAs and minicamps. While Mitchell and Poz have been given that role at times, Gailey made it clear that he wanted more than 1 ILB to know how. That tells me Davis has the ILB starting position and will make the defensive calls in September, unless he's injured. Poz will start next to him.
yes, for the reasons above...
the problem with your combination is that Mitchell hasn't taken snaps (or certainly not many) as an OLB so far.
because he has consistently practiced with the 1s up till now. Obviously that could change during TC and preseason, but for now, depending on the Schoebel situation, he's likely to start at OLB with (IMO) Torbor, or maybe Kelsay.