Well yeah, possibly sjuush & refrezh aren't getting paid as much as the other 3, but we've got no proof so we can't know that.
You got a source for your last statement? It's common knowledge that superstar players such as ZyWoO, S1mple, NiKo, etc. are getting paid more than their teammates, but just regular star players probably aren't IMO. If you have solid proof for your statement then feel free to prove me wrong.