Again, we get all wrapped around the axle by defining players as being either clutch or not clutch when the truth is someplace in between. IMHO at least half of the players are clutch and the other half aren't. Those who are VERY clutch are able to perform at, say, 50% above their norm. That is, a .300 hitter would hit ~.450 in clutch situations. That would then taper down to those who perform at their norm in clutch situations and everyone between those two would be varying degrees of clutch.
At the other end of the spectrum those who are not clutch (dare I call them chokers?) will hit at 50% below their norm. That same .300 hitter will hit ~.150 in clutch situations and those in between will also have varying degrees of clutch.
Of course that's not statistically provable because of the relative number of opportunities in clutch situations vs. the number of opportunities in non-clutch situations would be a relatively small sample size. As I said a while back, some things aren't statistically provable. They just ARE.
There will always be a debate about this because there are unresolved parameters.
1. There is no accepted definition of a clutch situation.
2. There is no accepted definition of what makes a clutch player.
3. Once a player has enough AB's for us to know "what he is" his number of PA's in clutch situations (whatever that means) will be so small as to be too small a sample size to be meaningful.
As for me, I feel the same way about "clutch" as US Supreme Court Justice Potter Stewart said about pornography. I can't define it but I know it when I see it.