We don't know exactly who made those patterns, except that Pete's demos are named. Tim Hüfken is said to be the artistic collabrator and the drumprogrammer. They could have chosen Tims patterns which is meant by "artistic collabration". The drumprogramming on albums like "Revolutions" wasn't done by JMJ himself either as far as I know, still it wasn't presets.
You can watch this from many point of views.
............ omg'sh.