Bills have historically really had a knack to scout UB and go for players. They scouted Dolac and like him.
Bills also ran the combine / pro day for Dolac as he was not invited to Combine.
No evidence Bills did not try to bring Dolac in for UDFA or try out.
That being said, no evidence they did. Sad thing is if Ciarlo makes it there really was a path for him.
Maybe he just wanted to go to Rams or saw a better path Forward there.