At Wheating's level, you don't keep improving by being a sissy and going "well golly gee I just hope I can squeeze out a PR again someday, because I've been injured and I have to be realistic."
That's for small-minded fools and cowards. Wheating has already shown he can run with the best in the world when healthy. Now it's a matter of staying healthy and being up there consistently, BELIEVING he belongs there.
When Manzano made his first few teams out of college, he didn't run particularly well at the major championships. We heard on the boards that Manzano only peaks for the national meet, that he doesn't have the "killer instinct," that he just isn't good enough to make finals, much less medal, etc. One Olympic cycle later, Manzano still isn't necessarily Mr. Consistency, but he's not as erratic as he used to be, and this time, in the major championship, he ran awesome and came away with the silver medal.
Right up into the final, people were saying "Manzano just isn't good enough to realistically expect a medal." However, if you had asked Manzano back in January, "hey, Leo, do you think you can medal?" I'm going to guess he would have said something like "of course I think I can medal, I just have to stay healthy, work hard, and believe."
That kind of confidence seems misplaced when an athlete is coming off a less-than-perfect season. Then when an athlete puts things together, people go "oh wow, that came out of nowhere!"
It could be that Wheating never stays healthy long enough to run up to his potential (I hope not). It's entirely possible. But during each rehab, each buildup, each period of "oh jeez, I can't believe I just did 10x400 at 62 and it actually hurt, I'm so out of shape" he and any other athlete with the A-standard is going to be saying "Keep on this grind, you can medal, you can be one of the best, keep being smart and working hard..."