As BOI said, for an actor to become a superstar, he needs to do something that makes the audience go crazy, and then he has to solidify it.
Both Tiger and John took by far their biggest openings and now they can potentially have big things coming in the future. Both made strides in the BOI ranking.
Take a look at their upcoming movies:
Romeo Akber Walter, Batla House, a movie with Anees Bazmee.
SoTY 2, HRvTiger, Baaghi 3, Rambo.
Tiger's next will be a rom-com type movie, followed by HRvTiger, so it might be too much of a gap between proper action movies for him, while John is quickly moving on SMJ's success and has one movie in March and one in August, both of which will have action.
I personally think that John will be able to consolidate better and gain some sort of following. Maybe not the sort of openings that SMJ got, but enough for the budget at which he makes movies.