Yada yada yada. Akainu this Akainu that- its boring already.
Its not safe to assume. Its your opinion and only that dont make it statement
Mingo is a pirate for decades now and he for last 10 years holded his own country. He knows who is who in new world and what chances does he have.
Sure fighting an admiral would be dangerous for him but all he said to Aokiji was! http://img.batoto.net/comics/2013/02/20/o/read512521f7136b7/img000006.png
So it seems that fighting admiral is risking life for Mingo and as we now know he had plenty different options to cover up stuff beside killing Smoker. So for me all it meant that Doflamingo would have chances even with Aokiji but he prefered to used different methods, not wanting to put his life on stake. Why he cannot at least take on Fujitora? For me with his status and what he shown till now he would occupy plenty of Admirals attention and his crewmates arent weaklings either as I see seats to be close to Laws level overall.
A) Him having a country is a direct result of plotting, which does not suggest anything in terms of power levels.
B) Him being confident in taking on admiral also suggests nothing in terms of power levels, since he has been shown to be incredibly arrogant.
C) Never said he cannot take on, just that he cannot possibly win. Whitebeard was Yonkou, easily in top five strongest people on the face of the earth. His crew were not weaklings either. Failed to take Akainu down.
Just saying, Admiral falling to flamingo crew would make it seems as if he was stronger then Whitebeard. And he had enough hype already.
Edit
Also, I used "safe to asssume" because I'm assuming. Not making statements