I don't think haki was a thing back then. So croc was definitely retconned into being more powerful. And still 2B bounty is literally half of shanks bounty who is a yonko with his OP crew and islands and what not.
I understand you kinda but look at Kids Bounty... 3B . Crocodile will be crazy strong with a Awakening and both types of Haki the next Time he fights