Does anyone know how old Ming Shu is by this point?

Analyse -> analyze Characterise -> characterize Hypnotise -> hypnotize

I think a part would also be the fact, that while Neji could see the movements of Lee, I don't think his body would be able to respond to it in time, thus creating a delay in Neji's movements that would increase as time went on.

Continuing on that, isn’t mentioned when he blows up Aunt Marge at the start of the Prisoner of Azkaban, he also had legilimancy and could have easily taught Harry to remove memories to put in the pensive for proof, but he doesn’t doesn’t that just point to the fact that he was aware but didn’t care enough or wanted it to happen.