The Bison is indeed much stronger than a Rook; leapers with 16 targets are typically worth 7-8 Pawns. The fact that these are leaps of range 3 makes it extra dangerous. In fact, I couldn't test Bisons as piece replacements in a FIDE setup, as it made the position non-quiet. Too many unprotected pieces on the back rank a Bison can attack with impunity. I suspect there could be the same problem here: after 1. Fh4 black already faces a mate threat. The white advantage here could be enormous (on the order of a Rook). I would have to analyze it with Fairy-Max to be sure.
The Bison is indeed much stronger than a Rook; leapers with 16 targets are typically worth 7-8 Pawns. The fact that these are leaps of range 3 makes it extra dangerous. In fact, I couldn't test Bisons as piece replacements in a FIDE setup, as it made the position non-quiet. Too many unprotected pieces on the back rank a Bison can attack with impunity. I suspect there could be the same problem here: after 1. Fh4 black already faces a mate threat. The white advantage here could be enormous (on the order of a Rook). I would have to analyze it with Fairy-Max to be sure.