Share 'Another rule question'

A player on our course recently threw a thumber that came down on top of the basket.  The disc landed with enough force to wedge itself halfway through the upper entrapment section.  It was ruled a drop in birdie on the course, because it was in the upper entrapment area.  So, I thought I would ask you guys if you agreed.  Second part, if it had wedged hard enough to make contact with the chains…