you can check out his videos at REH... And he actually uses uncommon picking patterns, inspired by banjo players. When he plays that kinds of stretches, he moves them diatonically, so that it sound likes a repetitive pattern of three notes up, then down, then up, etc...
here's an idea, pentatonic minor in A
___________________________________3_____5____8____
__________________________3_____5______8___________
__________________2____5_____7_____________________
__________2____5____7______________________________
_______5____7______________________________________
__5__8_____________________________________________
the first note of every triplet in picked, while the two others are fingerpicked...
Then, you can apply the same pattern , but to the pentatonic box higher on the neck.