No... he means that for the retail releases, there will be three Autobot headmaster toys that are about 15cm tall, and one that is going to be about 25cm tall because one is a voyager from two years ago.
Nothing to do with scale of characters.
It's about failing to replicate the four toys from 1987 who were all the same height.

Quote Originally Posted by Bladestorm View Post
If they use the SDCC Brainstorm don't expect it to be the same scale as the 2014 release.
The Brainstorm in the SDCC 3 set is much smaller than the Generations version from 2014.
That's actually his point.... the fourth Autobot 2016 Headmaster toy is not a regular release toy, so a lot of people might end up with one of the four being the 2014 toy that doesn't display well with the three 2016 toys.