Perhaps he could have been a good boxer had he started earlier on a proper training schedule with good technique instruction. But as others have said at present there is too much for him to learn to make a go of it in the HW division. Plenty of guys fight well at his age but have been doing so for 10-15 years and from all accounts Kimbo has only recently started serious training with Bas Rutten. He might get the odd lucky early KO against some but i'd say unless he finds a time machine MMA is where he needs to stay.