you are indulging in a post hoc ergo propter hoc fallacy. (or post hoc ergo copter hoc: add cymbal clash or tumbleweed as appropriate). you think because he hits the yorker for 6 then copters that somehow the copter enables the 6 hit in the first place.
The "copter" comes after the shot. the follow-through has literally nothing to do with the ability to hit the yorker for 6.
the picking up the length so quickly, getting into position, the hand-eye co-ordination, the bat speed and power are all evidence of genuine and relatively rare skill, but i repeat (and it is evidenced by others who can play a shot to a similar area from a similar ball without the follow through) that the follow through is unnecessary.
just bring your arms from a "backlift" type position through a shot as fast as you can... they don't naturally copter, but continue over your other shoulder. that is biomechanically natural and follows newton's first law... to perform a copter actually requires you to exert power against the natural arc of the follow through. (this is probably why dhoni has hit 6s in the same areas without coptering... it's not natural and needs to be remembered.)
as i say, it's theatre and good on him because it clearly energises his personal fanbase.
the only thing that surprises me about it being included in DBC17 is that nobody appears to have connected the shot to the "regional cover stars" thing and gone into a "dhoni on the box" fangasm.
