[So the Velvet room continues in the future. Minato knew of it, and now Akira. It at least meant that there was some connection to past and future that continued. After all, Nameless said he had been there for hundred of years, it only made sense.]

That's correct. However, all my friends also can...I assume your friends cannot.

[He's just going by the logic of the question.]

There's certain Persona that are better affiliated based on our arcana, and others only some of us can use.