RhA wrote:New heads would not have hurt these.
Agreed. But I theorize that it's because these are "Exclusives." The only unique head molds were Cliffjumper and Starscream.
It is time for new molds. Or this line is dead... I don't want that to happen...
You theorized correctly. Namely because the storyline to the series was completed long ago, and those being added from that point on are exclusives. That, and the Planicrons would be the best to explain why Dai Atlas and Gold Bug were not present, yet received their own exclusives. Plus, the remaining gestalt of Megatrons would both explain why Galvatron does not look any different and why Banzai-Tron is making a post-series entrance as well.
The rest, however, are explained in the stories made for the series.