If it is Kizaru, this dehypes Green Bull so much, as Luffy just stood back as casual as can be, while he was fighting against Momo and the Scabbards.
And it's not like Kizaru is even going hard right now, because he's facing off against Sentomaru, who he considers a friend.
So a not serious Kizaru, gives off a more powerful presence than a serious Aramaki... Not a good look.