I think this will be unique and great thing about Kimbo, to see how far he goes without Amateur experience, Only other person who done well with little Amatuer experience, "i can think of" is Anthony Mundine who had 4 amateur fights. As for Kimbo's chin, i dont think its bad in mma he slipped and got hit 10 times on the back of the head while down in that fight, and you cant do that in boxing.
what about rocky marciano? wanst he like 5-3 in his amateur fights and decided to go pro? I dont expect kimbo to get past journeyman level to be honest.
Lots of people care about Kimbo he attracts atention "he got almost 1 million Youtube views" for his first fight.