My keeping talent is absolute zero as I have never kept wicket in my life, but I remember watching a masterclass thing on Sky with Ian Healy where he says that basically all the catching cup should be doing is stopping your thumb spreading too far and that as a keeper you should never have to actually catch the ball there (but I suppose that is presuming your technique is reliable!)
Hi mate,
That's different to the Kookaburra catching cup to which the OP was referring to. Kookaburra have changed the set position of the thumb to a non-natural-but-better-prepared position to take the ball. You're referring to
the webbing between the thumb and fore finger which is now regulated so nowhere for a brand to improve on there.
Not meaning to come across as a know it all, just trying to help out. I am very much a full time wicketkeeping tragic.