[ALIBI]

Don't forget about your standard bumpers.

"STANDARD BUMPERS must remain within the BUMPER ZONE when the ROBOT is resting on the floor in PLAYING CONFIGURATION. They must not be articulated or moved outside of the BUMPER ZONE.

I suppose you could argue that the robot is no longer on the floor so the bumpers could be moved outside the bumper zone. However, for the reasons previously discussed and that I believe the intent of bumpers this year is to have them in the bumper zone at all times, a Q and A would probably tell you that you can not start on top of another robot.