Ok, that part I did not misunderstand, but somehow confused myself on what Don was recommending.
Putting wort from one batch into another seems counterintuitive at first glance. Seems like that would have some diminished efficiency with the grain. Would it not be better to reduce both batches at boil (after appropriate mashout, of course) until the total volume could be combined? Less efficient with labor and fuel, but most efficient with the grain. Or did I miss something on efficiency?
But, decoction sounds like something to be tried, if for no other reason than to say I've done it. Sorta like the one and only time I ever put a token in a slot machine in Vegas. Once was enough. What are the main benefits of decoction, versus simple step mashing?