SCRAP, what is this thumb thing he keeps going on about?

[Scrap]

Its all to do with the Kinetic link the thumb has in the body.

Do you mean if we didnt have thumbs, there would of been no reason for us to turn our wrists and arms around to grab certain things on certain angles and its that same group that allows us to turn them all into a punch sequence?

One of the reasons, but it also applies to the hips, tfl which governs the posterior chain.