The one kayak lurking might not have been a Great White. Who knows. How many people from Minnesota can ID different types of sharks?
But its not out of the realm of possibilities...
That's definitely a White in the video. And I agree that Whites will travel great distances to warmer climes for reproduction purposes, which would include Hawaii. Some of the large females who frequent the Farallons have been detected as far away as the depths off Guadalupe and Mexico.
But I just think the kayak was being trailed by a nosy Tiger. Had it been a White, it likely would've been capsized from beneath.