Rory could give him some trouble due to his length and reach and his striking is pretty good but not as good as Wonderboy's, none of them have his timing, range control, footwork, creativity, precision and versatility in their standup. If you just rush in on him you'll get countered because Wonderboy has good boxing too and he's also good at kicking off of his lead foot and not just his rear and tricky stance switching with unorthodox attacks his opponents aren't used to dealing with. He knows how to use angles well also.
Lawler would get knocked out and his wrestling is nowhere near good enough to threaten Wonderboy. Tyron's wrestling is good but the guy is small, compact and short with only big power but very basic striking like Johny has.
Wonderboy is a future champ and there's no question about it. He will hold the belt, it's just a question of when, and I see it being sooner than later.