What do you think of scooping the opponent's kicking leg and throw him off the ground?
If he kicks to the center-body and retracts you lose your balance and he gets your head.
You can do it if he kicks your head, but why wait and try and figure out what he is doing and wasting time that can be used by him to be more efficient.
You cannot afford for him to get that close with a kick to the head.
You only assume he kicks to the center-body since it is the most efficient (fastest reach).
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And you need to be efficient in your defense and offense, so you make your decision on time to treat every possible attack as the most efficient one.
If it was not the most efficient one, than you hit him before he even attacked. An in fact you had much less to do. Otherwise there could be a hypothetical situation that it takes him a minute to attack and you really do not have the time to wait.
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