Hmm. That IS a good point. It does seem stronger, but I'll have to compare a DPL decoding of the 2.0 versus the 5.0. Mind you that's also assuming it's 2.0 stereo and not 2 channel mono (something else I forgot to check).
Anyway, that's a good idea about extracting the center from a DPL matrix. (If I can figure out how to do that again.)