I'm definitely not saying Sengoku is morally worse than Sakazuki, Sakazuki is just a more goal driven individual, he chases after his targets relentlessly like a mad dog. What I'm saying is, whatever atrocities or "sacrifices" as he terms them he commits, he does it out of his own ideal of justice, he had already determined that Ohara was a sacrifice for the greater good, and finished it off with taking down the civilian ship, an act so extreme that not even the Government committed to doing, in this case Sakazuki was being even more thorough than the government. When the whole Doflamingo situation happened, Akainu couldn't contain himself and lashed out at the Gorosei, he only cares about his own vision of justice and wants to run things his way.
Sengoku is textbook pencil pusher, he's always nervous about the job, making him more inclined to please his bosses
His thoughts about Ohara were loud and clear, shut your trap and don't question the WG
If this was Sakazuki instead of Sengoku, he's either going to say how this is done for the greater good as he believes, or if in a foul mood there's a chance Saul gets executed on the spot because this mindset does not suit the navy in his books, a solider should be firm and just
Technically Sengoku's era had more top tiers
This is not a matter of powerscaling characters within the navy, it's simply that Akainu stern leadership and determination gave the navy a new spirit, this was bolstered by moving HQ to the New World
Jinbe did not sit down there powerscaling for sure
Aggression means more ambition, more spirit, something Akainu shares the most with Fujitora, which is why they lashed out at each other in that manner. Sengoku is faint hearted in comparison.