I've never seen a Haybuster run, but the chain feeder looks like a huge improvement when it comes to rotary straw or flat bottom hay bales, I forked a few of those f'ers out of Dad's highline 6xxx.
As an aside about the chain feed, is it reversible? I presume it's orbit motor driven, has anyone ever considered incorporating a bale unroller? I would hesitate to do it but you could probably just gas ax large rectangular hole in the side It would be right side discharge, above the shield and, if you could get it to work, a way to feed good hay without over processing it but still in a windrow. Or you could shred the moldy outside of a bale and unroll the rest. Process just enough to get the twines off? Is it doable?