The thing is, up until this year, the idea of an Arenas or an AI made some sense. This team desperately needed some scoring punch. And if Doc was able to find a way to use one of those guys as a volume scorer off the bench for 15-20 mpg, it might've worked. The bench was so weak on scoring that the prospect of letting one of those two jack 15 shots in 15 minutes per night probably would've been an improvement over what we had.
However, this year that argument goes out the door. Terry is everything that we hoped that either of those guys could ever be. And we not only have him, but we're going to have him paired with either Bradley or Lee, Green, Sullinger, and Wilcox.
Thus, a guy like Arenas would not only have to buy into the team concept to fit in with this team, he'd also have to buy into sitting on the bench and/or inactive list when this team is fully healthy.
And when you combine that with what everyone else said (the diminishing skills, the headaches, etc.) it just doesn't make any sense to do it.