Just heard that Ultrarunner Podcast's Eric Schranz claimed that Kipchoge would not be able to break Bruce Fordyce's 50 mile work record (4h 50min, 5:48/mile...). Kipchoge could run a 4:2x 50 mile easy. Even Jim Walmsley who is far from an elite marathoner could probably break the 50 mile WR if he really tried.
Are ultrarunners really this dellusional to what kind of talent and ability someone like Kipchoge/Bekele has?