Anyone got a clue about this stuff?
No ligament damage? If so that's a minor miracle.
Also having dislocated it, is it likely to be dislocated easier and often?
I'm in medical devices, and my last job was with a company in the foot and ankle sector of orthopaedics, advising surgeons on product usage etc.
It's pretty much impossible to get either a dislocation or dislocation/fracture without damaging the ligaments.
Only real exception (at least to the first of those) is in people with connective tissue disorders (such as Ehlers Danlos, among others) - which Gomes won't have.
The sheer distance the ankle has to move to dislocate and then fracture (usually the tibia that goes) means that you'd have some level of tearing in the ligaments - more often than not a full rupture.
Not sure where the 3-4 month shouts are coming from but IF accurate (and I'd be skeptical at this point) he's been ASTONISHINGLY lucky.