I still don't think we'll see M'Baye, Osby, and Fitz on the floor much together, let alone starting together. Everything that makes M'Baye effective and efficient, goes out the window if you start/play him at the 3 IMO.
Now.....with Cam's struggles this year, and the fact that Hield and Hornbeak probably won't be starter-worthy on day 1, I won't completely throw this idea out the window. I don't think it's LK's first choice though, more of a last resort.
I'll also add that it really doesn't matter who starts or comes off the bench between Osby, Fitz, and M'Baye. There are 80 minutes per game for the 4/5 spots, that is plenty of minutes to split up between them. I just worry about "losing" Fitz, mentally, if after 3 years of starting, he is sent to the bench. Both he and Osby will be seniors, so unless starting them simply isn't working for the team, I'm guessing that would be LK's preference.