I see now the errors of my ways with this poor question. I have been trying to keep my fingers assigned to certain frets in hopes that it will make navigating the first position easier. When I go from fret 3 to fret 5 with Mixo patterns 1 and 4, I stretch with the ring finger and pinky now. But with pattern 5, you teach us to use the middle finger and the pinky on frets 3 and 5 (5th string) and so on for the other strings.
Like I said, I see now that it was some faulty thinking. I need to treat each pattern separately, like I am getting into a different but similar car, just with the controls in not quite the same position.
OK. Got it, now.