[EricH]

Update #7 was only talking about bumper covers and the risks associated with their coming off during a match.

<R07-E> specifies the cover requirements, namely that the covers cover all exposed pool noodles or plywood. Note that Figure 8-1 does not show the cover going all over the back. This leads to the interpretation that "exposed" refers to any part of the bumper that could hit another robot. Plenty of robots have passed in previous years with the plywood back showing under an identical wording of that rule.

Also note that it is not illegal to cover the entire back of the bumper with the cloth. However, it may make mounting more difficult.