Do MSO/multisub systems show improved waterfall / ETC / CSD plots?

I have seen dramatic before and after frequency response plots of a single sub vs. after MSO tuning of a multisub system.

However I haven't seen before and after waterfall or energy-time or spectral decay plots - (I have seen the big improvements from active bass traps a la Bag End or AVAA.)
I presume these are improved too because the MSO tuning to an extent makes each sub cancel the standing waves from the other subs?

Cheers
 
I found some forum posts by Gedlee himself and it seems the short answer is "yes with multisub tuning bringing down a peak in the FR plot also reduces ringing in a CFD plot. 😎

My conclusion to this is adding a 3rd sub would be better overall, and increases output, than adding an active bass trap.