This same discussion comes up year after year.
Here is the exact same thread from last year.
I think the confusion occurs as a result of FIRST's use of "in addition to". It seems to mean different things in different places in the manual to different people. We are not allowed to use motors "in addition to" but we are batteries as long as they are the same as the ones that came in the KoP (of course only one at a time). The whole breaker panel "in addition to" the power distribution stuff in this years KoP is another example. FIRST could clear all this up every year if the wording was changed in some places to "as well as" or "instead of".