The difference I can see in some permutations of the Redan, especially the elevated tee variety is the lack of an upslope fronting the green. without this upslope, the ground approach gains viability. If nothing else, it moves that area up to #2 on the preferred miss list...and when you combine the risks associated with planning a miss into the #1 preferred miss spot (long and low), short gets even closer to #1 which makes "chucking in a grounder" more attractive...True, an elevated tee reduces the potential of a running shot because of a steeper angle of decent, but a downhill shot to a flat or downhill approach area will produce some roll out if the ground has a bit of life.
Sean, thanks again for the use of your line.