As I said, the focus changed. In both cases, Shanks is used as a reference, and in neither is he the best.
- In Skill, even though Shanks is used as a reference, Mihawk is better.
- In Haki, even though Shanks is used as a reference, the Haki shown was stronger.
More like Joyboy is dead, so if we're talking about living characters the giant's quote is indeed a huge indicator for Shanks.
:)