SSG will be sent after the warlords. I can't see more than 2 admirals being deployed for that. Not to mention that there is something else that had happened in Marie jois which the marines are trying to cover up
Nothing points to Kizaru being the strongest admiral.
Aokiji who had a disdain/rivalry for Akainu was almost his equal. Now that role has gone to Fujitora so if anything Fuji is the strongest admiral after Akainu