BeastProwl wrote:G1 logic does not apply to the films.
In movie 1 EVERYONE besides the bots and cons who were already on earth (Megatron notwithstanding) Had a Cybertronian mode. Sentinel Prime however, did not. He was already in altmode, way back when we first landed on the moon.
Wich was also before G1
Well, not entirely true if you count the prequel comics. when they show the decepticons on mars, there Cybertronian robot modes were very similar to there earth alt modes. and Sentinel Prime's robot mode on the moon wasn't exactly like his earth robot mode. There were subtle differences.