Dragon Supremacy.

Dragons with bloodlines are even more unreasonable in how they accumulate strength. Not only do they have ancestral memories they can also borrow power from their ancestors. 

He on the other hand has to eat and get life force for him to grow his stats. He can't just sit somewhere and continue to grow stronger. He has to be proactive to take advantage of his lack of limits. A dragon beats him in that aspect. 

What's worse is that a dragon beats him in the aspect of his POWER stat too. He can't even boast of that to a dragon because Dragons have that too. Theirs is even better. Normally, paragons gain a boost from external sources. Dragons are very different in that aspect. They gain their boost on their own by relying on their dragon heart. 

A dragon's heart is their weakness and also their source of the POWER stat. It is like a core within the dragon. It is similar to the inner world of a world beast but it doesn't contain an empty space.