we all assume the Spurs are currently focusing on McDyess, but I'm not 100% sure the plan A to bring in the missing big isn't still a trade.
the signing of Haislip for reportedly the LLE has pushed the Spurs over the threshold and adding 3 minimum contracts (Blair, Gist, McClinton?) will get them to +2-3 million over the threshold.
so signing McDyess for the MLE will cost them as much as 11 million per.
ok, we learned that they are willing to pay tax this year, but this are still the Spurs and it also doesn't take a rockets scientist to figure out that a trade of Bonner and Finley (or Mason) for a quality big might be cheaper AND might result in a better roster overall.
if the Spurs sign McDyess and with the addition of Haislip (and also Blair), Bonner will turn into dead meat. and it also might me more effective to get rid of Finley and therefore sign Bruce (to keep a "system" veteran guy).
I'm also pretty sure the signing of Haislip wasn't without intention to make Bonner even more expendable.