It's going to be very hard for Leinster to top their achievements of this season (I left the Pro 12 final with 3 minutes to go. We won, right?). What I'd like to see next season is the rapid development of players in the backrow and backline mirrored by development of tight five players. If Jamie Hagan goes back to Connacht, he'll compete with Nathan White to start and it will be good for Ireland. In Mike Ross and Michael Bent, Leinster will still have two Irish tightheads as their Heineken Cup players while it'll push Martin Moore and Tadhg Furlong closer to first team action. I'd prefer to see Hagan stay and push on but wouldn't stand in his way if he wanted to return to Connacht and Leinster got something out of it.
If Hagan does stay, I'd be very willing to loan Martin Moore out west for a season to give him some more game time as Nathan White's back up, with Ronan Loughney backing up Brett Wilkinson. Whether Connacht would want that or not is another issue.
Perhaps they did and Gray rejected the move. I doubt it but it's possible!