I am not an expert in the rules, so I would like to ask you a question:
(1) Is it possible that the +GOEs Chan received for some of his scratchy landings was due to his fast speed and footwork leading into those jumps whereas Oda's scratchy 4T did not receive a positive GOE was due his lack of footwork leading to it?
Yes it is. Chan racks up speed marks, difficult entry marks, etc. for most of his jumps.