That analogy does not make any sense. You have thing twisted Monica Rambeau legacy is not defined the name Captain Marvel what every they call Photon,Puslar, Spectrum she has been a dope hero. Monica has NEVER been the FIRST captain marvel however you try to spin it giving her the name Captain Marvel made her derivative or sidekick. Crying that are making Carol definitively Captain Marvel is backwards thinking and nothing Monica Rambeau has done being erased because of that move.
She is not popular character despite being avengers chairman and after that Avengers run she has been in and out of limbo. Going years upon years in limbo what book is Monica in now? Yeah that is right she in limbo again. If you are worried about her being a "sidekick" you have wrong priorities. She doesn't even have to be in the movie putting her in the movie is nice nod to that she was Captain Marvel a name she hasn't had for years and will never touch in the MCU. I am speaking on the reality Black Knight, Wonder Man, Hercules,Tigra aren't locks to show up. However they show up in MCU it is fine because they can easily skip over them. They tie Monica to Captain Marvel carol fine because it is not like Marvel was doing Dr Druid, Black Knight, She Hulk,etc Avengers run and they sure as hell weren't giving her solo movie.So yeah once again just using her is a blessing because as you can see she doesn't get used.
If you guys want to fight for crumbs of Captain Marvel name that is on you guys. Monica Rambeau is Spectrum her own brand. period .Build her up from that