I agree that the Army will show little interest in RAF Lossiemouth, or Kinloss for that matter, when there are locations much closer to army training areas being vacated by the RAF in England. They might just about be persuaded to move into Leuchars, but who knows.
Alongside all the recent upgrades to its infrastructure, one of the big advantages that Lossiemouth does have is its immediate access to uncongested airspace. In today's increasingly safety conscious world (and rightly so), a guaranteed safe flying training environment must be a real bonus.