I'm afraid you may be right, sadly...
I was thinking about buying a new GK, to help protect against lucky MCs (even DMCs) dribbling all across my defense like it was nothing, and having a lucky shot that ends up in the net. It's happening way too often lately.
But, I simply don't see what makes a higher star GK a better one. So I'm very, very, skeptical on spending my hardly earned tokens on a new one...