[@Negatomsk]

I think you're misunderstanding Doc's argument: it isn't the actual shock, but the force transfer and resulting acceleration of the skull that he is alluding to. No matter how durable a helmet, its durability won't influence the rate of acceleration; rather, that would be what its weight, and the resulting inertia accomplish.

As result, the skull will accelerate as normal - taking into account the head's total weight and the resistance of the neck muscle - and the brain, suspended within the cranial caivty, will actually be directly impacted by the full force of the skull's movement.

Headgear can still help is the force is somehow directly absorbed: for exmaple, through deformation or breaking, which makes padding and ceramic ballistic plates good at what they do - but simply distributing the force over a larger surface will have no effect over the acceleration. Not too sure which of those two Lobo's armor does; or if both.

However,

[quote=Negatomsk]
As Gonad's head shot forward, Lobo's was rocked backwards from the impact
[/quote]

the act of acceleration is clearly stated in your own post; what's left hanging is it's magnitude.