therockiswwf
The voice of Michael Cole's headset
Other thing is, for Bryan I think its more creative then just the injury. WWE cant risk screwed up Rumble 3 years in a row. So they are probably saving him for night after Rumble or even after Wrestlemania.
WWE is a business. Businesses like money. Daniel Bryan makes WWE money when he is working. WWE loses money when he is not working. This is 100% health related.
If they were worried about the Rumble, they could just have him get "injured" around Rumble time. Why keep him off for a year? Why keep him off when their roster is riddled with injuries? Makes no sense.