Pretty hard to make the argument that the Rudy Gay trade made the Grizzlies "the team they are".
Gay was traded for Tayshaun Prince, Ed Davis, Austin Daye and a 2nd rounder that became Jamaal Franklin.
Prince was a good fit for one and a half seasons and added defense (and a much lower usage rate than Gay) and Davis was a decent backup but Daye never contributed much and Franklin was waived after his rookie year. And no matter how you look at it none of the players they got in that trade are paying much in the way of dividends now.
Daye and Davis were allowed to walk as free agents and Prince declined quickly and was eventually basically a salary dump in the trade to Boston for Jeff Green. In fact, Green is the only player on the Grizzlies that you could even argue is on the roster in any way due to the Gay trade.
On the other hand, the Pau Gasol trade (for which the Grizzlies were hammered at the time) is the one that really helped shape the current roster.
That trade not only gave them Marc Gasol, but additional draft picks and lots of cap room that they used to restock their roster.
http://bballbreakdown.com/2015/01/2...zzlies-are-still-winning-the-pau-gasol-trade/