#3 Yes!

Daniel Bryan's legacy in pro wrestling translates to something that is almost indescribable. People love him so much and now that his WWE career is over (unless he can pull off a miracle) fans cherish the time they had with him as an active performer. When people chant "yes" it is an amazing ode to Daniel Bryan who was in all reality one of the best rebels in WWE history just because of his passionate fan base.
In fact, all it took for the crowd to break into a rousing "yes" chant was to mention Daniel Bryan. When his name was brought up when telling about how Kane chokeslammed him into darkness last week on Raw the crowd erupted into "yes" chants.
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There were also a few more moments where the crowd agreed with something and broke out in the same chant. It's a great homage to Daniel Bryan and a universal sign of affirmation at this point as well which has transcended into other genres of sports.