[12 piece bucket]

I think that Bucket is saying that the "flat" that we see from the skin side of the wrist does not necessarily mean that the bony articulation within the wrist joint is in its neutral position.

If you have a lagging force acting on a rope and you pull the end of the rope then the rope will go straight -and it looks straight...

If you have an ON-PLANE lagging force acting on the wrist joint then it too should go into a straight line relationship... in the vertical plane of hammering nails ( assuming you like a vertical nail and are good at hammering) then you have a vertical ON-PLANE lagging force ( hammer head)...

What i understand from Bucket's pics is that these guyslook like good hammering people and the lagging force has presumably pulled their wrist joint in line... but LOOK, LOOK, LOOK at the external appearance ... small cup is apparent...

So it seems that an in line, on plane relationship of a wrist ASSUMING A HAMMER GRIP ( this might not hold for golf grip???) gives a small cup.

Here's a different looks at it . . .