Here is a fun fact that should blow your mind....
Daniel Bryan salary for 2016 $700,000
Big Show salary for 2016 $1,200,000
John Cena salary for 2016 $2,700,000
Randy Orton $1,600,000
Sheamus $1,300,000
Jericho $974,000
Mark Henry $877,000
Yep thats right even though Bryan has become the second face of the company after John Cena he gets paid less than Big Show. Bryan is under a 5 year contract with 2 more years to go meaning that for the last 3 years he has made $700,000 per year. Plus Bryan was completely milked by forcing him to do all the appearances, interviews, and media events such as being in Total Divas for the last 3 years while Big Show gets paid HALF A MILLION more for staying at home and sporadically appearing. Total Divas doesn't pay a separate salary Bryan gets paid the same 700k whether he was on it or not and of course you know that the "E" made him be on it in order to exploit him and get the most bang for their buck.
Wwe expected Daniel Bryan to do all the work that John Cena does outside of the ring for alot more than half the pay. In fact for $2 million less. Of course Daniel Bryan was seeking to renegotiate his contract and get paid better for all the work he was doing. And Vince in his cheapness manipulated the company doctors to stop Bryan from receiving "John Cena" or even "Big Show money".
Vince is a stubborn old man who would rather ruin and destroy someone than pay them their just money. He thinks that he has to do it because its best for the business because if Bryan demands and gets more money while under contract than all the other talent could do the same. So Vince would rather sacrifice a little in order to save his kingdom and make an example in order to send a warning to the others. The concussion issue was just an excuse for Vince to get what he wanted.
Despite the fact that these wrestlers are famous and on TV they are grossly underpaid by Wwe. This is because out of all the sports Wwe talent have no union. Vince gets around this by saying that Wwe is not a sport and just "Entertainment", additionally most of the wrestlers are no employees of the company but independent contractors an as such cannot get a union.
Good luck to Daniel Bryan hopefully he will now seek a legal way out and take the "E" to court so that he could go to TNA in the future. Hopefully we won't have to wait two years. But in the meantime i would caution him to never leave his drinks and food unattended (that a heart attack or stroke inducing agents can be slipped in ie Ultimate Warrior) and check his car brakes or for any little suspicious boxes(that allow for a car to be hacked and driven by remote control ie Michael Hastings) under the hood every single time he gets behind the wheel because "Vince is Vince" and he never ever loses.