Thanks. This is exactly the clarity I needed.
Now, one followup query (for clarification, please) . . . Between the reps of deadlift, I do have to release the bar, and alternate my mixed grip. Is that acceptable? It does give me a tiny bit of additional time relative to simply lifting, lowering the bar (which in my case is about 50% letting go of the bar), lifting again . . and so forth. Or, am I supposed to maintain the same tight grip on the bar throughout the set (and not loosen grip between repo? [Wow! That would be scary.

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Also, very interesting . . . . the last paragraph of
this article. I am not necessarily agreeing with it, but I just thought I'd point it out. Also, I do realize that the author is not advocating 5 sets . . . he is suggest suggesting "thinking" of it it in that way.