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You may not want to accept this answer from me, because header pair combinations in 4-2-1 headers are obviously a point of confusion for me still but from what I've learned and can figure out there is no "correct" pairing as long as the length of the primaries and secondaries are taken into account.
Usually you'll see short primaries on 1-4 2-3 style merges. That's fine.
Usually you'll see longer primaries on 1-2 3-4 style merges. That's fine too.
A 1-3 2-4 merge style is effectively the the same as a 1-2 3-4 merge style.
It all depends on where you want the power to be and length of primary and secondary has a big part in making your merge style of choice work properly.
cool, thanks
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