So happy this turned out so well for ALL of you!
The thing is....not only did I show him exactly what to do 3 separate times, I also left printed instructions complete with pictures (picture of the cat + this dish + this dry food + this wet food). He was also feeding my outdoor ferals, though, and I have different food for them. So rather than referencing the instructions I left, he thought he was supposed to give all the cats all the food 2x a day. So they were eating 2 types of dry food in generous portions and double helpings of wet food. I'm sure they ate more of the dry food out of boredom, too.
What a wonderful update!
It's excellent you have such a good catsitter... just a bit of retraining when it comes to the feeding.