User blog comment:Zakzoor4/Sion-Rework must be made/@comment-11623843-20131027161341/@comment-1330314-20131027194426

I don't think that's the actual problem, though. Sion's stun and shield are actually both very good on him even when going AD (in fact, the stun may even be more useful than if he went AP). The problem with Sion is that his mechanics allow for very little counterplay. If he builds straight AP, he has a very large amount of inescapable burst and can emerge from any fight almost unscathed. If he goes AD, his stun allows him to kill enemies before they can recover.