You deduced this because he beat JCC Jr. in an 8 rounder? He's a middleweight that stopped training years ago. Had Anderson gone the boxing route he probably would've squeezed down to light heavyweight (175) until he couldn't make it. Then as he aged he would've had to move up to cruiserweight (200). I don't doubt that he could've been a legit contender in his prime and maybe even eventually won an alphabet title but all we can do is speculate. When a handful of guys in a given division are able to call themselves 'champion' the term itself becomes severely watered down. In reality there is only 1 champion per division. That's how it works. The rest is just the boxing business attempting to convince casuals that there can be several.