Then Frenzy should be blue, not purple.
And I would've thought that the decision to give Hasbro MP Soundwave toy-accurate yellow eyes was to better differentiate the toy from the TakTOM version, which I think is a good idea. Making Frenzy blue would've also been a great way to do this while also making it more consistent w/ the G1 toy accuracy theme. But if they wanted to keep the same purple colours as w/ the TakTOM version, then why not name him Rumble? I highly doubt any fans would complain that at long last Anglophone fans will finally have a G1 Rumble toy, named Rumble, who looks like Rumble in the cartoon!