Yes I noticed that too Lynn, seems rather a coincidence. The mathematical probability is: 4/8 x 3/7 x 2/6 x 1/5 = 1/70. In other words, in a motor with 4 deficient pots, the odds of them all being centre pots is 1 in 70. It's quite suspicious but I can't think what it might indicate, unless perhaps BOTH head gaskets are leaking between adjacent pots, which is quite some distance in this case.
Of course, the effect of this 1 in 70 chance is that all four weak pots fire consecutively, followed by all four strong pots, followed by all four weak pots, etc. In terms of crankshaft acceleration / deceleration it's the worst possible combination.
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One of the original Australian CMP hunters.
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