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.