Mystery of Aaron Judge glance is solved.
https://theathletic.com/4526717/2023/05/17/yankees-aaron-judge-blue-jays-tipping-pitches/
Paywalled, so ill give you the condensed version.
"Before Jackson came to a set position, he brought his hands up near his ear as he gripped the ball. The grip, indicating which type of pitch he was about to throw, was visible to Yankees first base coach Travis Chapman, according to multiple Jays sources."
From Jackson “It was (less) my grip when I was coming behind my ear. It was the time it was taking me from my set position, from my glove coming from my head to my hip. On fastballs, I was kind of doing it quicker than on sliders. They were kind of picking up on it."
Blue Jays manager John Schneider said “he didn’t see anything” with his team’s catcher, Alejandro Kirk.
It's also the reason they were being so attentive to the yankees 1b and 3b coach positioning, thinking that had they been in their boxes, they wouldnt have been able to pick up on it as clearly.