R6a states:
Products from the Cortex, VEXpro, VEX IQ, VEX GO, VEX 123 or VEX Robotics by HEXBUG product line cannot be used for Robot construction, unless specifically allowed by a clause of <R7> or cross-listed as part of the VEX V5 Product lines.
I believe this is an error (one that was present last season too). In the Tower Takeover game manual, R7 was the "Certain non-VEX components are allowed" rule, which has now been moved to R8. I believe the direction towards R7 in R6a should be changed to R8 because of this.