Somebody that Akainu talks friendly with Low diffs Doflamingo.
I feel like he,Chaton and Momo are pure strong forces, so low diff make sense, I see them above guys like King/Marco to be honest. It make sense since Jinbe said that the Navy became even stronger. And in fact it fits to the previous Navy structure:
Old Era:
Kong>High Top Tier>FleetAdmiral
Sengoku>High Top Tier>Admiral
Zephry>Mid Top Tier>Admiral
X?> Mid Top Tier>Admiral
Garp>High Top Tier>Vice Admiral
Tsuru>Low/Mid Top Tier>Vice Admiral
Akainu>Low/Mid Top Tier>Vice Admiral
Kizaru>Low/Mid Top Tier>Vice Admiral
Kuzan>Low/Mid Top Tier>Vice Admiral
During Kong era, we easily had around 9Top tiers in the navy. And the new one is called as the strongest navy ever. So it make sense if Kuro can stomp guys like Doffy.