Took Juan a very little bit to get into a rhythm to break Jodi down. He quickly found coming on like the gang buster with "dumb sister" didn't work, so he tried a different tactic. Juan had to learn on the fly since his only personal contact with Jodi has been the cross.
In my nonprofessional opinion, Juan is doing a great job. By the end of the first day, Jodi was saying the rehearsed script, but not looking like it. You can see her whole face and eyes have changed. Jodi's trying to use on Juan the one on one 'charm' that's worked so well for her in the past, but on the big stage it's looking manipulative, and criminally conniving.
The Jodi we saw in direct took years of rehearsal and planning. The cross is basically a cold reading for both Jodi and Juan. He knows what's in the script. She doesn't.