So, Boyness...

Yeah, his adenoids are really big, so we're going to remove them. They're almost certainly the reason he's having hearing issues.

It wasn't his hearing that prompted the dairy elimination - it was over-the-top hyperactivity/lack of impulse control/frenetic energy kind of behavior. And the dairy had in the past brought on the lack-of-hearing episodes reliably, so we still think he's allergic - just that the dairy wasn't the only thing making his ears not drain properly.