I mean, Baam upscales ridiculosuly above the feat as well, ridiculous is not enough to put into words, and literally wouldn't matter, because massively faster and so on without any actual calc is by all standards, useless
Body stamina? no, fightning for 3 days is better than him, but sustaining attack? depends, with shinsu loop well...
Since he also use the surrounding shinsu to mantain a loop of endless shinsu, which don't get weaker, in fact, it only gets stronger the longer the attack goes on