I'm sorry but that's a completely different argument and has nothing you do with the point I was making, which was that it doesn't matter who the ball comes from.
The contention that I was objecting to was the one saying that, "If the ball is kicked along the ground by an opponent and the defender kneels and uses his knee or get on the ground to use his head to pass it back to the keeper it is not circumvention."
Now you have completely changed the scenario to a ball played in the air and coming to the player at chest level.
Just to reiterate, it doesn't matter who the ball comes from, it only matters whether the player uses a deliberate trick designed to avoid the restrictions in Law 12 on using the foot to play the ball to the keeper.
In the example given in quotation marks above, if a player receives a ball kicked along the ground to them and then kneels down to head the ball to their keeper, this is a deliberate trick used to circumvent Law 12 and should be penalised as such, no matter whether the ball was played by a team mate or an opponent.
This was confirmed by the IFAB as follows:
View attachment 2221
Nowhere in any of my posts in this thread have I referenced the scenario of a player receiving a ball in the air at chest level and that was not the situation you originally posited either, so I'm not sure why you're introducing it now.
As I have said in previous discussions on this matter, it does make a difference whether the player receives the ball on the ground or in the air, however what does not make a difference is who the player receives the ball from.
For what it's worth, what I have said before and what I'll repeat now, is that if a player receives the ball in the air such that he can play it with a part of the body other than the foot without resorting to a contrived or artificial bodily manoeuvre, there is no circumvention.
So in neither of the "overhit cross" scenarios that were described earlier, is there circumvention but that has nothing to do with who the ball came from and everything to do with the actions required of the player to avoid using the foot to play the ball.
In the example of the player juggling the ball from chest to shoulder and shoulder to head, the player may have used a "trick" in a general and non-specific sense but (and this is the important part) he has not used a deliberate trick to avoid the restrictions in Law 12 on using the foot to play the ball to the keeper, since the ball never presented itself in a manner conducive to using the foot in the first place.