Nina did a very similar thing in the first 6 months as well. The only way she'd go to sleep is to fed, or rocked. The time it all changed for us, was when we introduced a sippy cup with EBM. She's a very independent baby, so when we introduced the sippy cup, she'd rather lay in her cot, hold her own bottle, then go to sleep, without us interfering.
Nina now knows the routine so well, that as soon as she sees me preparing the bottle, she starts rubbing her eyes as if to say 'ok, i'm tired now'!!
The daycare will (or should) work with you. And at the same time, they will try new things with him. If they think he'll go to sleep on his own, then they'll try it.