To see a specialist, get some labs done, and have a post interview with the specialist or a clinic team outlining the diagnosis and course of treatment doesn't involve a lot of time. Maybe two-three appointment sessions in as many days. It's not as if he's being admitted for surgery and, say, a 72 hour stay, plus designated rehab started after. Even then, it's not a lot of time.
What happens after he returns to LA, how effectively the team staff of trainers and coaches monitor the plan will be telling - regardless what they learn from the specialist.
I'm not a doc; that's just this layman's experience and an opinion based upon time spent with ex-footballers, rodeo riders, bikers, fish bums and other social miscreants for well over half a century.