Does everyone remember the Dwyane Wade foul on I.T., it was March 9th 2015. If you watch that play he falls directly on his right hip and makes it very clear that the pain is in that region.
This kind of injury is often - usually - cumulative; for most people there isn't even a single causative event that they can identify. But this one that you've found looks more relevant than the Towns collision, which was diagnosed as a bone bruise at the knee joint (!) at the time. In any case, what's likely is that multiple injuries contributed to the labral tear.
Let's be clear about something: there are TWO issues.
1)There is a labral tear. There are lots of ways that that can happen from a traumatic injury, such as something like the DWade collision you're showing.
2) There is a FAI - that is extra bone growth on one or both of the two bones that meet at the hip joint. That is a condition that predisposes the joint to labral tears.
It existed before the labral tear and was not caused by an injury.It
sounds like Dr. Kelly is proposing to shave off the bone growth. If that works, then "all" IT will have to do is rehab the labral tear.
This is a steep climb of recovery. Thomas will have to be strictly guided by the doc - trying to come back too soon could result in a big setback.
Will he come back as good as ever, or will he come back at all? It would be amazing if he started playing NBA basketball before the all-star break, but it's better not to set a timetable.
By the way, kudos for finding this.