I could see Ghost Rider fitting in the Doc Strange/Blade corner of the Marvel U, but not as main guy. Then again, I never cared for Ghost Rider.
The first 50 issues of the 90s comic was the bee's knees.
But GR has the same problem that the Hulk has, Hollywood takes a thinking and speaking character in comics, and turns them into mindless fighting machines. They strip them of their character, and make project of their hosts Johnny Blaze/Bruce Banner.
Though I've always thought Marvel should do a supernatural super team. They almost had in the 90s with the Midnight Sons imprint, but they never made that final commitment.
Dan Ketch Ghost Rider
The Three Witches