McMillan is the Mike, sorry, but Kiko's not going back to Mike as long as McMillan is healthy. Kiko is the Will, but I do expect him to fare better next year alongside McMillan. At Sam, I think we'll see competition between Chase Allen (my preferred choice) and Stephone Anthony, as well as possibly a rookie or FA.
Don't be surprised if we stand pat at LB though. We have one solution in McMillan and we're committed to Kiko, who has both good and bad tape. We play 2 LB's most of the time. We're not going to draft a LB in the 1st, so people salivating over Roquon Smith are likely to be disappointed.
It is possible that we play even more nickel/dime coverage and stick a DB like TJ McDonald in as an extra LB. With Raekwon McMillan as our primary run-stuffer, we could scheme more to funnel the run game into him.
Personally, I know people will be frustrated by it, but I'm expecting us to again invest in DL and not put a ton of resources (draft or FA) into our LB corps. In a 43, your DL needs to dominate, and ours needs work.