I'm not really seeing anything unusual myself, but I'm no doctor. The dude has a very strained gait, but he completely blew out one knee a few years ago working that comeback match in Spain. Even before he totally blew out that knee, he had a very labored walk like had bad wheels. No surprise to hear of a wrestler with shot knees later in life.
His making up with Vince really came as no real surprise. Once he did that commercial, it seemed that the Hall of Fame was a near certainty. I think personally that the seeds of reconciliation came from the conclusion of the defamation lawsuit around the Self Destruction DVD, of all things.
When everything was coming to an end, Warrior wrote about the deposition, namely that of Vince himself. He wrote how Vince was asked what he thought of Warrior as an employee, how Vince's answer stunned him, his attorney, maybe everyone in the room. He then went on to say, with some regret I think, that had he known that back then, things might have been very different.
For all his criticisms of Vince, he never failed to put over the man either. He always complimented him on being a hard worker, having a unique vision he was determined to see through, even when everyone else thought he was crazy.
And on a random note, the last time I heard the Ultimate Warrior theme song on Raw was when Pat Patterson and Gerald Brisco were coming out to Hulk's then Warrior's theme songs. So glad the last time I'll ever hear that music blaring through the speakers on RAW was done the right way, with fans chanting, cheering and marking out.