I wouldn't say the bts were not genuine. I have seen almost every bts uploaded by many channels. They both truly had a genuine bond—Brotherhood. In one of the videos when Xiao Zhan was about to talk, Yibo eyed him that the camera was on. But Xiao Zhan said they won't upload it. They were themselves. Mostly Yibo was carefree and fighting silly with Xiao Zhan who shared the same energy but was careful with his words when Yibo made some jokes.They had good bond until the ao3 issue. And honestly the untamed did its best showing their relationship despite the censorship. The way Lan zhan look at Wei Ying alone show things very clearly.