The big toe theory notwithstanding, the logic is sound. For instance, in that fight with Amada from which I took that first gif, Cro Cop seriously injured his right foot low kicking Amada for three rounds (to his credit, he still came out for the finals against Mike Bernardo, but one low kick from Bernardo put Cro Cop down in a painful heap). He also had a busted left ankle going into that PRIDE fight with Hunt (hence the shoes) and which he fought the whole OWGP with (hence him throwing no LHKs against Minowa and only one against Yoshida). And then Peter Aerts
blew up his foot when he caught it on Francisco Filho's elbow.
Of course, this isn't to say that nothing bad can happen if you land with the shin - again, poor Aerts
split his shin open something nasty (and, again, courtesy of Filho, who clearly had some kind of voodoo curse on Aerts
) - just that it seems less likely that something bad will happen.