Quite the generalizations about officials, don't you think? Should I make sweeping judgments about how most coaches are a$$holes simply because a few of them are?
I don't blame the refs for enforcing the rules as they interpreted them at the time, though I agree with the follow-up ruling that allows him to play. If he, his parents, and doctor say he's healthy enough to play, I say let him compete.
That said, I'm not buying that he's on the field based on qualifications. There is no way you can run-and-block, sustain a block, or sustain a burst through the line without the legs to drive off. When he blocks, he has to use his arms to jump up, then launch his body to make the block. However, few blocks are successful with one launch, they have to be sustained to be effective. By definition he can't sustain a block.
It's great that he works hard to try to compete with such limitations, however competitive sports aren't the place to play someone out of generosity. That's what rec leagues are for. There are thousands of other kids working just as hard who get no attention for their accomplishments.