I feel our guard rotation is going to be solid this year. Obviously our starters--Rondo and Ray Allen -- are very sound. The first two off the bench --House for Rondo and Tony Allen for Ray-- gives us a complementary set, with Eddie supplying the firepower outside, and Tony able to slash and create.
Here is where Doc has a trump card--Gabe Pruitt. If either Tony or Eddie struggles (and of course they will from time to time), Doc can go to Plan B, Pruitt. He is capable of replacing either guy, and filling in quite ably. If he comes in for Tony, Eddie moves to the 2 on offense, and Gabe runs the show, as he has proven quite capable in pre-season.
This is how Doc ended up running the team during the play-offs, with more success as we got deeper and deeper. If Sam came in and was on fire, he stayed in. If he was disrupting the offense, then he got pulled and House came in. I see a similar strategy for Doc during this regular season.
As for Sam, I really think he will be in street clothes much of the time, unless we get off to a slow start, and Doc wants to shake things up.