Sometimes designs are conducive for such a scenario, others not so much. The primary category for the Skyline was to be a flipper, not a knife to be a thumb stud opener. We were establishing flippers during the time of its release (OD-1, Skyline, JYD's, ENER-G's, etc...) The designer accomplished exactly what the goal was. Hopefully that helps with you being puzzled.
If one is looking for a knife that primarily opens with a thumb stud, the Skyline is not your knife.
If you're after a dual threat (flipper/thumbstud) then the Skyline can work as SaMX describes.
As a flipper, that's it's sweet spot. :thumbup: