Just had a look at the clip Lloydie (it was blocked in work "porn"!!! let's not go there with the IT chaps in work), any way, Oyama does not seem to be "blocking", more of taking the kicks, but we must remember that these guys are Kyokushinkai, they train for 'knock down', and so they condition their body's to take a pounding (like Azzy's in the process of doing).
Interesting footage though, Oyama resembling the late Kase Sensei in the way he moves, using circular punches; as Kase Sensei once said "1944-45", Oyama was once a student of O-Sensei Funakoshi, with no doubt a little influence from Yoshitaka......
Will have a word with Moley about conditioning excersises, seems that there's a lot of complaining that the sessions have been getting a little too easy.