by Mike Cole on Tue, Nov 29, 2011 at 11:59PM   How's this for weird? ESPN's Chris Broussard tweeted an interesting failed trade proposal that Celtics president Danny Ainge reportedly offered the Oklahoma City Thunder after last season. According to Broussard, the C's offered the Thunder point guard Rajon Rondo and forward Jeff Green in exchange for point guard Russell Westbrook and center Kendrick Perkins. Trading Rondo, one of the franchise's cornerstones would raise eyebrows as it is. However, the fact that this trade would bring Perkins, who was traded at the deadline in a deal that brought Green to Boston, is the real eye-opener in this scenario. Alas, Oklahoma City was not interested in Ainge's proposal. Rondo has been the subject of plenty of