This is a submission from someone who wanted to stay anonymous but attempted some lips reading of the Chicago Panel : 

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Here are two different video links to the same moment. It’s at 30:33 in link #1 and 29:40 in link #2

https://www.youtube.com/watch?v=pKrACiE_Yxw

https://www.youtube.com/watch?v=yyB03ImgG_s

This is what it looks like to me:

David: (leaning over to G) Hey Gill(?), wanna come out? [pause] Wanna come out?

Gillian: Wait, what? Who is? [looks off-stage]

David: [nudging her] No, no. [gesturing between them] I’m talking about us.

WHY David was making jokes(?) about the two of them coming out in the middle of a comic con is beyond me, but…I was floored when I saw this. If that’s indeed what happened. So it looks like at least one of them wasn’t/isn’t as reluctant to go public as we thought!

end of the submission.

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I’m always kinda skeptical with lips reading, it does fit, but I wonder if it’s because that’s what he said, or because now that’s what we want him to say lol! I’m adding some gifs to the post so everyone can judge for themselves.