Thread:Ryousha/@comment-25832917-20150912233622/@comment-691135-20150913061151

Props to RepublicVictoria for this upload confirming it is a form and not a rider (taken from the raw):



As you can see, Go has already transformed into Mach, and the Chaser parts are a different shade, one of them overlapping a Mach part temporarily indicating that the Chaser parts will go over the top of the Mach parts to create Chaser Mach.