Thread:TomasDerksen/@comment-27496405-20161113165206/@comment-30173978-20161113171148

All we know is that it happened few years ago. My suggestion is to put it during the fall of SHIELD. If it happened late 2013 SHIELD would hear about a guy with a flaming skull burning people just like they heard for all of those powered people in Season 1 which is mostly set late 2013. If they investigated smaller events like cleaning after Thor and a floating fireman boy scout they would hear about Ghost Rider.

I know that Ghost Rider wasn't really thought about until Season 4 but it would be a great "in universe" explanation why SHIELD didn't investigate him. They didn't because they were fighting themselves (HYDRA) and didn't have time to investigate "strange" events.