User blog comment:JustSomeDude.../761- Let's talk about Chapter 595!/@comment-24442815-20140919200836/@comment-10543621-20140922050627

We've seen that one Yonkou+allies was enough to fight the world government+shichibukai in a world shaking war. Clearly, the amount of influence and power a Yonkou wields is at a completely different level.

To me, Doffy is a man of ambition (with a twisted and lame motivation), he has lots of influence and power, but clearly he knows that he's still rising himself, and is not quite ready to clash with Kaido.

His fear of Kaido may be related to Kaido's personality as well, on top of just with strictly 'how much more powerful is he' sort of situation. For example, if on a scale of 1 to 10, we place regular pirate crews from 1 to 3, new world pirate crews around 4 or 5, maybe Doffy's at 7 or 8 while a yonkou like Kaido is about 10. Perhaps it's not that Kaido is overwhelming stronger than Doffy, but that he IS strong enough to destroy Doffy if he wants to. Factor in personality, you probably have a situation where Kaido is someone who would go all out to destroy someone if he really wants to. That could contribute to Doffy's 'fear' of him.

We've now seen that Doffy's lack of fear for the WG is his hold over them via this secret. Clearly, Kaido isn't threatened by anything like that. I think part of Doffy's fear may also be more of fearing that his plans are too disrupted. He knows that in order for him to continue amassing power, he can't afford to offend Kaido. That's about it.