I did look at that part. The more I look at it again, I think that is it.

Indeed. It's held similar to the door weatherseals - rubber with pretensioned metal built into the channels. Mine is not loosey goosey but along the windshield leading to the door, it's not ~super snug~ Drivers side is fine, but the passenger side shifts from time-to-time. Don't notice it till you happen to stand there with the passenger side door open ajar, and you see where it pinches a little...