Need info on B-Pillar Window Channel Installation in GTB

I'm in the process of re-installing the rear triangular windows in my 1987 GTB. When I test-fit the window assembly, there's this large gap between the top of the B-pillar window channel and the bottom of the drip rail trim.

Here's a picture of the window assembly in position without any glue or rivets in yet:

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Here's a picture of the same spot on my car at the time I was disassembling these windows:

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I don't think I'm missing any parts, but was this gap really filled up like this with glue at the factory? Does anyone have any pictures of what this is like in their car?

(Note that this gap is underneath the rubber door trim that will eventually get pressed onto the pinch weld.)

 

Gotcha, so if I'm reading this right, I'll need to put adequate sealant into the big gaps at the top & bottom of the aluminum window frame that gets riveted to the B-pillar.

Yeah, this design is pretty crappy. I've been guessing that Ferrari planned (or hoped) that the drain holes in the bottom edge of the window gasket and in the body work right under the window gasket would be enough to let any water in that area drain out, so all the seals had to do was direct water to the drain holes. But based on, e.g., the BaT auctions on otherwise pristine 328s that all seem to show water stains on the parcel shelf, I'm thinking that the plan failed.