Powers & Abilities Other Strawhats using Haki? (despite no official confirmation)

[Julius]

Brook showing his Observation Haki here possibly?

 

[Cozy Sofa]

I thought so too first but Brook clearly heared the "splash" and then he just puts 1+1 together knowing S-Sharks move set. Same with how Brook saw, not felt, Sanji saving Nami.

 

[Herrera95]

Would suck they having haki out of nowhere. We saw Usopp unlocking his.