Because that's where CoO matters, in 1vs1.
Not in nonsense situations like your example where Ray is actively trying to detect animals while Mihawk isnt.
That's just your cope, Mihawk was never surprised about Zoro's strength but about Zoro
already beating them.
But, keep coping. I am sure it will affect anyone's CoO which they have to prove in 1vs1 where it matters.