This is spite, MJJ is omniverse threat period and so is MM depending on his mental state. Only way Sentry can beat MJJ is to take him to unspace, even without that Sentry would get curbstomp worse then Gleen for the walking dead.
I don't have a horse in this race, but are you really incapable of seeing a valid argument for a character with powers on Jaspers's level? Your example of Owen is also valid, but this rather pithy question really does nothing for discussion, and is a disservice to everyone to pretend you couldn't possibly be wrong.
Owen and Jaspers have feats beyond anything Sentry's ever done, by several orders of magnitude. The fact that Sentry resisted Owen's powers is indeed an uncomfortable anomaly without easy reconciliation, though many have pointed to his mental state at that time. But based on the totality of their abilities, their peak seems safely higher than Bob. To me, at least.
Gender: Unspecified Location: In Hell, torturing your soul.
I totally see Jasper power-level.
I don't see how he could possibly do better than Molecule Man at that point thus bringing the same fate for Jaspers than for Molecule Man in the end.
The mental state of Molecule Man isn't what affect his powers... At least not during Dark Avengers where he was crazy but totally in possession of his powers with only positive beliefs in his ability to use them.
I've pointed out that, when he was put in jail, Owen was depressed because he couldn't find his way back to Volcana after she dumped him, thus making him depressed...
One of the main attribute of the depression is that you completely lose the ability to trust in yourself and into what you can do.
I pointed out that Quasimodo talked about Owen's depression in the Dark Reign Files, where Owen, during his time into prison, was incapable to use his powers in imaginative ways, incapable to manipulate genetic material and other stuff that are directly mentioned in Dark Avengers as things he can do, thus proving that Owen was back at full power...