It seems unfortunate to me that the owners of Universal Studios never bought up Marvel or at least distributed all their movies given what a central part of the MCU Iron Man has played and how they had him be a weapons manufacturer who changed to trying to use his technology to try do things he thought was better for society. It would have fit well for Universal building a theme park on the area that used to be a rocket testing area for Lockheed. I think they probably would have been willing to work with Universal to do things that would have fit well with such a themepark. I noticed that in the 2003 Hulk movie after the general military person says "Show him the way out" to the Hulk, Hulk then climbs up this tunnel out of this underground laboratory. This is similar to the rollercoaster at Islands of Adventure when the coaster is in the dark tunnel before it shoots out. After the Hulk leaves this tunnel he bursts through some covering that was on top of the exit of the tunnel and then goes jumping upwards and forward several times. This has some similarities to the what the Hulk coaster does at some points on the ride.
The character Monica Rambeau who has been referred to as Captain Marvel in the comics at some points in time seems to be on one of the shards. I don't know what title she was referred to in the contract with Universal or under what name she has been referred to in comics while wearing that costume if she has been referred to by only one name while wearing that particular costume on the shard.
Many characters have been referred to as being part of various teams for varying periods of times in certain comics. I think you would have to look at the contract between Marvel and Universal specifically to see if Stephen Strange was considered to be part of such a 'family' in the Universal contract.
Here's something apparently quoting from a lawsuit between 21st Century Fox and some business associated with Marvel Comics that mentions character licenses:
From :
Twentieth Century Fox Film Corp. v. Marvel Enterprises, 155 F. Supp. 2d 1 (S.D.N.Y. 2001) :: Justia
"Twentieth Century Fox Film Corp. v. Marvel Enterprises, 155 F. Supp. 2d 1 (S.D.N.Y. 2001)
U.S. District Court for the Southern District of New York - 155 F. Supp. 2d 1 (S.D.N.Y. 2001)
August 9, 2001
155 F. Supp. 2d 1 (2001)"
A director for a Marvel film has said that a group of aliens is allowed to appear in both Marvel Studios movies and Fox movies:
From:
Marvel/Fox Skrull Movie Rights Explained | Screen Rant