Straight from the NFL rulebook: "It is not a simultaneous catch if a player gains control first and an opponent subsequently gains joint control." What you're saying about getting both of his feet down first is completely irrelevant to the topic. You're debating what constitutes a catch, but that's not what this is about. It's about control (possession). Jennings gained control first, then Tate's hand got stuck against Jennings' chest, which I supposed you could call joint control, on some level. But that didn't happen until after Jennings gained control first. And as you stated, "The Packer DB clearly caught the ball first in a physical sense," and you're right that this doesn't constitute a catch. It constitutes control. Tate, at some point after, gains joint control, and when they hit the ground, it's a catch. For Jennings.