Credit to
Bruno for
this one, which he has been advocating throughout the offseason.
Spurs would do this to shore up the front court. While, yes, the front court has been significantly improved over last season, a lot rests on an aging, injury prone Theo Ratliff and DeJuan Blair to back up TD and McDyess. Foster provides a starting quality rebounding big for the rotation, one who can step in to the starting lineup if need be. We've seen what Bonner logging heavy minutes in the rotation can do to the team's defense last season (though without him the team would have fared worse during the regular season). I think the benefit of Bonner's outside shot is less valuable now as you have another big in McDyess he has enough range on his J to space the court for TD. Adding Foster would have the effect of not putting too much pressure on Blair too soon. While, yes, he looks like the real deal, he's yet to play a 100 game season and he does need work on his D. The Spurs didn't really want Finley back this season. While yes, it's nice to have a veteran shooter like him in the backcourt, it's more of a luxury at this point. This would also allow the Spurs to retain both Hairston and Williams.
Pacers would do this primarily for Finley and Bonner's expiring contracts. In Murphy, Granger, and Dunleavy, they have some rather big contracts for a team which is still in rebuilding mode. Such a trade would also be Caucasian neutral, which apparently is quite important in Indianapolis.
I think the biggest concern for the Spurs would be the impact to team shooting, the loss of experienced depth in the backcourt, and that Foster's deal would extend past the end of the season. Allowing Finley and Bonner's contracts to expire would help them to mitigate the significant increase in team salary which the Jefferson trade and the McDyess signing have created.