Untrue. It only took a matter of months for both HOLLYWOOD HULK HOGAN and Andre the Giant to return from these injuries. However HOLLYWOOD HULK HOGAN had had additional three years recovery time thus ensuring that he is in even better health. Because he is the greatest of all time and he is still more fun to watch than anyone or anything currently happening in wrestling.
Have you forgotten how the Rock was host of WrestleMania XXVII before he returned to main event back to back WrestleManias (and win the world title)? Seeing as how the WrestleMania card is decided upon the year before, it's very likely that Vince felt that there wasn't enough time to shoehorn a match worthy of HOLLYWOOD HULK HOGAN into the even and decided to wait until the following year.
Oh my God, Hogan is an old man now. Hogan and Andre the Giant had their match at Wrestlemania 3, that was 27 years ago. He was only 34 at the time and in a lot better shape than he is today. He might in your eyes be the greatest of all time, but the man is 61 years old now, he's not the wrestler you're thinking of. Get out of the past for your own good.
And the Rock has nothing to do with this thread. You keep talking about Hogan like he is in his prime and he isn't. He might want to wrestle again, but he will not, and I repeat will not get cleared to do so. The WWE will not want another Ultimate Warrior on their hands.