Bearcat looks more like a GB racer than a FW to me. I don't think the FW broke any new ground in trying to mate a large engine to a small airframe either. I don't dispute the quote about the FW by the Grumman team, but I'm not sure I'd accept that the Bearcat is a FW knockoff. In fact, sounds like a slam against German engine manufacturing to me. By war's end aircraft are starting to look kind of a like to me... large radial engine, small airframe, bubble canopy... sounds like Georges, LA7s, Bearcats and probably much more. The Bearcat looks like a streamlined Wildcat with a monster engine to me too.
As I've said before... Give me a Bearcat and I'll stop whining about the LA7.