I'll just say again that winning or losing is a red herring. Look at Conor McGregor in the boxing match. He didn't win. But he held his own against an elite boxer. I see judoka periodically in local bjj tournaments, and they do okay. Depends on their level of training, but they learn where their hokes are, and some do really well. How would a ninja do? I think not well, even though it is also a grappling art.
If a krav guy wanted to know how good he was at regaining his feet against competent grapplers, it's not rocket science, guys.