That's what I'm thinking too. That's why, IMHO, he seemed unaffected by J.'s screaming.
In all reality, J. probably does this a lot off camera (even without being locked in there or whatever he was) and Tim has to handle it.
So for this latest live, which was probably Jenn's idea, Tim would be painting (working again) while Jenn sat there chatting away.
I know Tim came and sat down eventually and it was the two of them but I'm pretty sure when he heard the screaming with his roller in hand, he was internally like "No way, bitch, YOU go get him and be a mother this time. I'm over it."
Like you said, he may be FULLY realizing now - and now that it's too late with a 2nd child coming in weeks - that he's enabled a not-so-hot-chick to basically do absolutely nothing.
And we all know he KNOWS that typical stay-at-home-moms (which she is!) do NOT sleep until 11 a.m. every day.
And we all know he KNOWS that typical moms without health issues (pregnant or not pregnant) do NOT get driven all around town with full lack of independence to even take their kid to the grocery store on their town.
And we all know he KNOWS that editing doesn't take 75 hours a day.
He just can't say it.
ETA: Also, they both suck. I just think she sucks more.