I still question his adaptability as a coach, but you can't argue with the success he's had. As others have mentioned, it's up to Gorton to fix the blue line and hopefully the team can finish it's "on the fly" rebuild/retool. If he's going to let AV continue to employ this defensive scheme, he needs to find the right players for it.
As far as the timing, I think this is just a message to the team that Gorton is confident with the way things are going, and it eliminates some of the uncertainty that surrounds the off season plan for the team.