Arrogance.
King Novak of Melbourne, the First of His Name
The weak link angle was before that. By June of 2013 (which is when his real main event push started), he didn't lose a singles match clean until the Rumble against Bray. After that, he didn't lose clean until Roman at Fastlane 2015. He didn't lose "multiple times" to anyone except Orton, one of which was the MITB cash in, and the other being the HIAC where HBK superkicked him. In fact, he has multiple wins over Roman during that period.
Hell, they sold his flying knee as a death finisher until that match. Roman was the first person to eat one and win, the entire point was to make it a big deal that the guy who was beating everyone gave everything in his arsenal and wasn't good enough to beat Reigns. And to nail the point home, they had Bryan cut a promo the next night that basically said "go get em tiger, you're better than me".
Bryan did end up on the wrong side of a lot of beatdowns to close out Raw and a lot of Authority fukkery, but in the ring? Man was damn near untouchable for 18 months.
And this is why you have guys on this board who didn't fukk with BD/DB who shyt on his fans, because he wasn't a 5 foot 7 Stone Cold in matches and segments and people cried about it. I don't like it, but I see their point.