Yes, is the simple answer. They've just disbanded a GR4 squadron there, so that leaves you room for one. I'm pretty sure at one point Lossie was home to 5 squadrons (someone who has a better memory than me can correct me if I'm wrong; weren't there 4 sqns there plus the Jag OCU when it was 16 Sqn?), so you could maybe squeeze in an extra one.
Failing that, as the Typhoon force is expanding while the TGRF is contracting, I'm sure they'll figure something out. One GR4 sqn out, one Typhoon sqn in, etc etc.