According various sites even though Daniel Bryan has been cleared to return to the ring that doesn't mean he has resign. Actually as of this writing he has yet to resign his contract and could still leave come September which is when his current contract expires. This could likely point to the reason why they refuse to give Daniel a higher position on the card and started him with Big Cass instead of someone already established. Even though I know a lot fans believe that Daniel should be higher up the card but one needs to think about it from the company's perspective that they shouldn't invest to heavy in someone who might leave. I for one would love to see Daniel featured as highly as he was during his first run and even be given another shot to be World Champion, but right now I don't see that happening.
After doing a little research it does still seem that Bryan's contract has not been renewed and he could leave come September 1, but could not appear on the All In event. Right now I don't think their is any reason for Daniel to leave as the company met him half way and found him a way to get back in the ring. However, it takes time to see if Daniel can handle being back in the ring over the long term. Even though most fans would appear to think that Daniel should leave due to the booking but in reality it has nothing to do with that. In my opinion the company is using Bryan to the best of their ability if he was to leave the company in the fall. Right now the position that Bryan is currently in with Kane is the best place for him especially if Kane is looking for one more run before he finally hangs it up.
Overall currently the last I heard Daniel is negotiating with the WWE for his contract and could still resign before September. I think that Daniel should find a way to stay with the company as even though it would incredible to think about the idea of Daniel being featured on a Ring of Honor or New Japan event. Though it wont happen in the next two months it is to appealing of a thought to see Joe vs Bryan, Nakamura vs Bryan or Styles vs Bryan on a show. Right now Bryan belongs in the company as even if something did go wrong the best place for him to be in would be WWE.
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