Forum:Can someone clarify on ace?

so i'm catching up on the one piece anime, and since i'ce been browsing around i've seen that the magu magu fruit is of a higher order than aces ability. this doesn't make any sense since i read the wikipedia entries on both, and it said magma can reach temps. of around 1500 degrees celsius, while fire can can reach alot higher assuming there's alot of oxygen present. so how does the physical attribute of magma overcome the much more awesome element of fire.

one other thing i noticed is the ability of the atsu atsu no mi fruit from don accino. if both ace and akainu are at the "limit" assuming they follow real world rules then couldn't the don defeat both of them? i took a pic of his ability at the end of episode 334. he uses his ability at 10,000 degrees celsius. [here]