It shined in Alex' scene the most in 0.6IIRC he's been helping Cari every once in a while but he joined as a full crew member around 0.6. It was also during this time when he really started to shine since he switched to a better animation plugin (Timeline) that, in his own words, allowed him to add more manual physics animations in the body (and thus give the sex scenes a little bit more "oomph").
Dalia's scene wasn't as impressive even though there was some good animation. And all the ones that follow are just incredible. He'll get only better for the next updates