I would agree with having variant numbering for toys which are variant characters (e.g. G2 Lambor, G2 Bumblebee etc.), but in all fairness, I can see why they would have separate numbering for wholly new and different characters. After all, the MP Nissans all had separate numbers, as did the original Seekers (MP3, MP6 & MP7).
Just dump the numbers and call it masterpiece and name. Finish full stop no need to over think it.