I think if Davis can learn quickly, he can be the kind of person you want paired with Anderson, a low post presence who will clog the pain on D and who you have to respect around the basket on offense. I foresee that combo complimenting each other well. But you are right, it probably makes more sense to have Lopez come in, set the tone, let Anderson get more burn against the 2nd teamers, but then come playing the serious minutes down the stretch. The problem is that I think Davis and Anderson could both be big liabilities in terms of fouls. Davis is a young, aggressive player on defense, and with the quality of offensive PFs in this league, he could have some real problems with fouls. Anderson in general is a little too undersized to play D on a lot of centers in this league, regardless of their offensive abilities.
If Gordon misses serious time, I think you have to go with starting Mason Jr., or Henry, at least initially. Rivers looks too green right now. Perhaps if he makes enough improvements, or if Gordon goes down and they are something like 19-46, then give the kid some run and let him grow and gain experience.