Originally Posted by dolores:
He is in pullup at home. When he needs to poop he goes into his bedroom, closes door and poops in pullup.
Oh he understands what is going on and uses all sorts of clever excuses to get out of sitting on potty.This is a very smart, social, verbal boy who is full of exuberance with a touch of defiance. He has been talking a lot about Santa and Christmas and loves riding on train. Wondering if parents can make reward/consequence around those things 
...? And how long would those crutches be needed?
That sounds exhausting. Barring any valid mental or physical delays, and especially if he is that clever, he needs to be told “Four year olds wear underwear and use the toilet.” at home. His parents aren’t doing him any favors reinforcing to him that he can’t perform a basic human function. Calm, matter of fact presentation (we put a coat on when it’s cold. We eat when we are hungry. We use the toilet when we poop) with no weight and with logical consequences (here’s a rag, let’s get cleaning) EVERY time. This needs to be happening at home before you will have any luck at daycare at this age.