Norm, that last jointer pass is oh-so-very-thin and only to clean up the saw marks on the edge. There is little chance of the two edges going out of parallel if proper jointer technique is observed. Remember, we're talking one 1/32" pass here! Now, if you had a bunch of these to finalize, the planer is a great way to finish that last edge by ganging them up and running them all through at the same time...as long as you have a snipe-free planer or leave extra length...
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The most expensive tool is the one you buy "cheaply" and often...