Kirock, you are quite correct, this was an AWESOME episode! Finally, we see Mitchell actually knows how to walk the walk!
As to Daniel, no, I don't think he knew Vala was on board until AFTER he got there, he was just not wanting to 'Ascend' again!
Sooner or later, the writers of SG-1 HAD to take on the whole 'nature v nuture' battle. They didn't seem to do it very well with Teal'c and his son, and Anubis's, uhh, son/clone?, didn't really count. Vala and her child will be a very interesting battle, I'll wager ONE of the writers has just found themselves with a teenaged daughter and is at wits end about how to raise her! Hopefully the REAL daughter hasn't had to have a gun placed to her head to get her 'in line'!