Well Pico, that felt obvious since he was only 19-20. Bo is 27, he doesn't really have time to spend years developing on the regional circuit. And let's face it, the UFC is helping Bo develop before challenging him with Jamie Pickett, Tresean Gore, Donovan Beard...none of these guys on paper have/had anything for Bo and he's being matchmaked this way on purpose.
Pico is a very different case, Pico himself and his team wanted all the smoke and thought they could beat world champions before ever even having an MMA debut. As for the prospect Pico was, it was unprecedented. He was the first Cadet world champion from the US in freestyle, a national champion in Folkstyle, an Olympic Trials finalist who beat multiple D1 all Americans and National champions at just 19. He was a multiple time juniors amateur boxing National champion trained under Freddie Roach and a European and Californian Pankration champion.