We do need to figure out the % when each character is forced into lying down on the ground after a Dthrow. The % where this might work varies per character (you'd have to consider weight, fall speed, DI, character frame size, etc).
I played around with Dthrow -> buffered DACUS in training mode against a lvl 9 MK CPU set to around 53%. There might be a percent that's more favorable, but this was approximately around when MK would first be forced into the lying down animation.
When he was forced into the lying down animation, I had a high success rate landing the buffered DACUS. The few instances where I failed have two possible causes; his get up attack invincibility managed to kick in on time (which means that buffered DACUS is worthless against MK) or I canceled the dash attack too early/late. I am hoping it is the latter.
Teching in place and behind Wolf will always allow MK to avoid the buffered DACUS. The two times I managed a buffered DACUS against tech roll away, I just barely missed him. As the CPU MK rarely tech rolls away, I am unable to confirm if it was a timing issue on my part. However, it seems likely that all forms of teching will allow MK to avoid the buffered DACUS. Note that charging the buffered DACUS slightly might add just enough distance to beat tech roll away while simultaneously covering the non-tech options.
I lack the time or frame by frame equipment for truly in depth testing. This was just me playing around in training mode and not definitive data.
EDIT: I did not try Fthrow as it looks very escapable; the opponent should easily be able to DJ/Fair/whatever long before your buffered DACUS reaches them.