May be an unpopular opinion, but I'm not sure if Ghost Rider fits well into MCU. I have a feeling if it's remade as a separate movie, and it's not Nick fucking Cage, it can actually be really good.
Ghost Rider is in the MCU, the AoS version, not the Cage version.
Also, if you haven't noticed, the Darkhold has been showing up pretty much everywhere.
They didn't at the time. Marvel was teetering near bankruptcy and only survived because they sold off the movie rights to their characters. It's impossible to overstate just how important the success of Iron Man was to the company.
Also, if you haven't noticed, the Darkhold has been showing up pretty much everywhere.