We normally hit the cut time at the "i just jumped..." but its a volume and tempo/dynamic build up that can actually increase 10-15 BPM as that section rolls on to its creshendo, "Might as well be meeeeeeee,, yhea!" ....then the magic starts balls to the wall. But, I would not be surprised to hear it done every way to saturday thru the years. FRED has a point, finding your own way is less contrived and way more interesting IMO for all involved including the listener, while still remaining very Dead-esque/authentic.
How would the Dead do it? The way they fucking want to.
Plus, after playing it 50-60 times you may wanna have a change in ways like they did, so going your own way with the small stuff from the start won't hurt the final product, IMO.