Rafting Whitetips?

In the footsteps of his dad: Tumbee in action!

Interesting hypothesis!

But is it plausible?
Having seen scores of Reef Whitetips ride the thermoclines in Cocos, I would not necessarily expect to find them resting in flotsam that is being swept across the Pacific; instead, I would expect them to elegantly ride out those currents to their ultimate destination, like I've seen them do many a time.
And although it is certainly plausible that some may get swept away, I would not at all exclude that they may simply get the urge to relocate once their home reefs gets overpopulated, and therefore catch a passing current on purpose.

But that's just detail.
All-in-all, this is really cool research - kudos!