In my life drawing classes we'd done at least half a dozen slightly different types of gesture drawings, some with more some with less developed detail. There's also a book the teacher has showed up a number of times (not nicolades) that has easily 20 different types and styled of gestural drawings. being that we're still noobs we haven't used all the types yet.
Something I'm remembering about gestures is that the emphasis is more on what the figure is doing, and the general big picture character, very general first impression, proportions (a base that one can use to start tightening things).
And, yes what Elwell is taking about student vs. pro gestures, we get told by our teacher(s) too... the more you learn and more skills you acquire, the more correct and non messy stuff you are expected to capture fast.
Hopefully I can dig out the book name where all the gestures he talks about are shown....
This is one of them, but I'm not 100% sure if it's the same one. http://www.amazon.com/Life-Drawing-P.../dp/1581809794