The reason other motors are showing up in 25.5 is because of the growth of the class and gain in popularity to the point that ROAR has a VTA format that would allow these motors to be run. Now the number of tracks that run ROAR VTA yields a bigger perceived market than the entire VTA class would have had just a few short years ago.
I could be wrong, but some where I can hear a board member say,"Dang! We need to get onboard."