He is basically the 9 or 10 guy anyway when the Celtics are at full strength, so if it comes down to who the Celtics keep between Davis and Powe, it seems obvious to me.
This is where we don't agree. I think Powe and Davis are on pretty even footing, and when the team returns to full strength, they will both be used, and the only difference in minutes will depend on matchups, and what is needed for that particular game.
Davis got the starts, because he was a better fit with the starters, while Powe was more valuable to the bench.
Yes, Davis was getting more minutes earlier in the year, but that is because Powe was struggling. Powe has been a completely different player over the last month or so, and he has been essentially their 6th man since then (granted some of that time Davis has been starting).
Personally, I think there is much more of a chance that they keep Powe, since his skillset is harder to replace.
That's a TP. First positive thing I heard you say about Powe! 
Seriously, all I want is for Powe to get a 3MM/yr contract for a few years. Powe will play hard regardless of the number of minutes he gets and that's another reason why he would be a valuable asset to any team he plays for.
Yeah, see, I think I have been labeled as a "Powe hater" for no reason.
I'll admit that I am a Davis fan, but only so much. I think he has helped this team win a lot of games this year, so I feel the need to speak up when people go over the top bashing him. It was the same way with Scal. I never thought he was a great player, but I felt the need to defend him when people went overboard in their criticisms.
So of course most of my posts about Davis ended up sounding overly possitive, just because I was trying to explain why the overly negative posts were so over the top.
I am actually a HUGE Powe fan. He is one of my favorite players on the team. He is tremendously fun to watch, and plays the game it is supposed to be played. But that doesn't mean he is free from criticism.
I just think they are both very valuable players who have contributed a lot of positive things to this team. They are both role-players with flaws and strengths, and when it is all said and done, they both are pretty irreplacable on this team right now. And whether they will be replaced next year will have to do with who is available to replace what one of them brings to the table.
I think with stars, its easy to argue about who is "better", since generally they all have pretty well-rounded games, and can fit into any team. But when you are talking about role players, it has much more to do with the role and fit than who is "better".