If Xebec truly mid diffed the Admiral then he absolutely beats Fuji and Greenbull 2v1. If God forbid it was a low diff we need to talk.
There are 3 options:
1. The Admiral was among the weakest Admirals ever
2. Rocks used a dirty trick, similar to Teach's behaviour
3. Rocks is him and stands above the likes WB, Roger and Garp