I'm wondering why people like Walker so much more than Giddens. Just my opinion of course, but I like Giddens' game much more than Walker, because Giddens has an all around game... really fills up the stat sheet and is an excellent defender and great rebounder, which I know Danny likes. I guess Giddens is more expendable because Ainge offered him up in a trade to clear a roster spot, but it's possible that Ainge might think he has more trade value because he's been playing a bit better than Walker, and because of Walker's injury history.
I'd rather keep Giddens though. Unfortunately for Giddens, Walker plays a position of need for the Celtics (although they are about the same height). Giddens would be the perfect replacement for Tony next season or the season after if we hold onto him.