He was legitimately Cody's lone bit of non-Brock adversity (which doesn't count really if you think about it) that he faced between losing at Mania 39 and winning at Mania 40. A good face should have to overcome adversity.
Yes, I know, he tore his pec. And Seth still jobbed to him inside Hell In A Cell. That man had been virtually bulletproof until the Rock made him FAFO.
Speaking personally, The Rock laying the smackdown on Cody outside of his bus made me OK with Cody winning the title. Frankly, it made me more interested in a Cody/Rock feud than Cody/Roman.
I would also suggest letting the run play out in full before making a judgement call.