All Admirals are around the same lvl, let say Aramaki is the weakest, the gap to Fujitora and Kizaru would be still close like:
Kizaru 100
Fujitora 99
Aramaki 98
Extrem high diff fights to each other.
I understand the disappointment of some user here but we have nothing off downplaying Aramaki. His feat against King and Queen are still top. I think we need to wait for the chapter but it don't change anything for me.
Admirals are mid top tiers, above YC1lvl characters. It just Yonkou seems be one lvl above that(high top tier), it is not that Aramaki is to weak, it just mean Shanks is that strong.