A bit later, once the party really gets going and Marco's checked on all of the crew that need checking on, he ducks out of the way to let Ace and the other party animals take over.

Which means switching to hybrid form with wings and talons, and flying up the mast when he thinks no one's looking. Which is how he spots Vyse. So he grabs a cautious perch next to him, and gives the other pirate a curious head tilt. Maybe Vyse was looking for peace and quiet as well?

"Yo."