I've said it before and I've been thinking it more lately, the kid glove treatment is trashing this guy's psyche. Sure, the knee hurts, I get that, but with all of the coddling and over-protective nonsense I think they are seriously contributing to a downward spiral of lost confidence.
I had an aunt that did this same kind of shit with a cousin of mine; hovering over him every time he scraped his knee, or cut an elbow and it turned him into a gigantic pussy for most of his childhood years and it wasn't until he got into sports and had a coach who was a little bit of hard-ass and didn't accept excuses that he kind of broke through mentally and stopped being afraid of the world.
Greg needs a little more Sarge and less Marge.