Gallagher needs to make sure he gets first team football. The competition is strong for starting spots in Scotland defence right now and Big Dec - who joined the squad as a backup, remember - has grabbed his chance and just got better every game. There are plenty of others breathing down his neck if his form drops.
If he ends up with a move, however, where he's not a regular starter then it becomes more of a challenge.
On a slightly different note it will be interesting to see how the Scotland team lines up in the next couple of games. Clarke said he'll need to freshen up the personnel for tomorrow's game after the heroics on Thursday. I wonder if that will mean giving the defence a makeover (although, arguably, the back 3 doesn't have to put in as many yards as the rest of the team).