User blog comment:KidVegeta/Canonicity/@comment-3097771-20101130082822/@comment-3097771-20101130090413

My argument has yet to fall apart. I think even if he did train in Super Saiyan with the yadrats (which is speculation which can not be confirmed nor denied), he was still inexperienced with it, and only wished to use it as a last resort. Which he did, when Cooler was about to kill him. -KidVegeta