Whether or not Authentic wears earplugs, if Beezie thought that was the cause I’d think she’d have said that in her blog rather than the sweat hypothesis. I’d think if it had come dislodged (assuming he wears earplugs, which we don’t know), there would have been some evidence to that effect when they took off the fly bonnet. As in, “hey look a loose earplug” unless it worked it’s way back in, which is possible.
As for it taking a lot of sweat to cause that effect, I think that’s why they took off the fly bonnet. Thinking that perhaps the bonnet caused his ears to sweat more than if they had been open to the air by holding in the heat. And I don’t know about you, but in hot humid conditions it only takes one drop of sweat running just the wrong way to annoy me quite a bit.
I’m thinking he probably doesn’t wear earplugs, because if he did, it seems like it would be less likely for sweat to make it into the ear canal. Which would make Beezie’s guess about the cause of his headshaking make less sense to me. But that’s just my guess based on Beezie’s blog, I have no inside info here, LOL.