So basically his "body" is really a Mega Pretender shell with what little they could salvage from Kup housed inside. Man... Kup would freak if say a hole was ever blasted through his chest and he peeked inside to see remnants of his original cerebral cortex strapped inside! They should make a toy of this for Universe but a revamped Brainmaster gimmick (after all we had Universe Cyclonus as a Targetmaster); the small "brain" unit could represent the original Kup with the main body being the "Pretender shell."
The US comics did reveal Thunderwing's nature as a Pretender with an inner robot during the Matrix Quest. Although we never saw Thunderwing's robot form, he did mention that he was a Pretender and thus had first hand knowledge of the relationship between a Pretender robot and his shell (which he exploited to incapacitate Bumblebee).Originally Posted by Sky Shadow