#2 Daniel Bryan returns at the Royal Rumble
The doctors have cleared you to fight. You want to fight. The fans want you to fight. This should be enough reason for any pro-wrestler to be in the ring unless you are in the WWE and their doctors don't allow so.
Who knows maybe the WWE is just doing that so he finally returns at Royal Rumble. If he does, then expect Shane McMahon to be involved and cause his elimination and finally leading to a match between them at Wrestlemania.
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This can also officially be the heel turn for Shane McMahon whose actions right now is somewhere that between of a face and heel. Shane and Daniel were showing differences in their opinion before Survivor Series and Royal Rumble should be the perfect place to escalate it to indicate a match between them at Wrestlemania.