Well yes I get the idea and that's why they're really keeping Bryan in the dark, but it's so stubborn and utter stupidity. DB could easily sell some more seats and brig a little fire back right now. But Vince is backstage "Roman is #1, damnit! Fuck that troll!"
It may come off stupid to us, but it's actually smart on Vince's part. Reigns is Vince's pet project and for the record, I like Reigns.
But, why bring the most popular guy back from injury when it could ruin Roman's overness? So, Vince is gonna play "we're just worried about his health and we don't wanna take any risks" and "we're also currently dealing with a lot of concussion lawsuits, hence why we're hesitant to clear DB" card. It's been working out well for him thus far.
Vince also doesn't see his buffoonery could make Reigns flop as a champion and future #1 babyface of the company. The machine is too hands on with the guy. Just let him breathe, for Pete's sake.
Now, to answer this: "DB could easily sell some more seats and brig a little fire back right now."
Well, yes. But Vince's plan is to keep Bryan on the shelf as much as possible. Even if DB wanted to leave and head back to ROH or Japan, Vince would wanna milk as much as possible out of DB's contract to prevent him from leaving and making money for someone else.