Being just below world level isn't shameful. The fact he took the Whyte fight worries me though. He clearly had fundamentals he had to work on after Joshua, but didn't. He took the fast cash route rather than the slow rebuild he needs.
I'm done with Parker as a fan if he doesn't change trainers and actually start to work on his flaws. These were things that were apparent for time which Parker made no attempt to improve on, and this is the logical result. He's a good kid, but he needs to get businesslike and stop treating his coach and managers as friends, because they certainly won't be so chummy after he's no longer relevant on the scene.