They want Ville and Stan in - those are two of the guys being evaluated (or potentially showcased) - so Miller comes out.
I'd assume Miller is a lock for the right side - but who knows
Stan's been penalty free the last few games - other than fighting. Yes, he gets called a lot but I assume the org is aware that big guys don't get a break from the refs and if they want him to play an aggressive defensive game (and it's obvious they do), he might get called more than a lightweight - it's a trade off I suppose.
Perfect players? Who said anything about perfect? These 3 are interchangeable 6D at this point - far from perfect.
The only point I'm trying to make is that they are not done evaluating - doesn't matter if you or I have already made up our minds.