Yikes! What were you listening to those keyboards on, chony?
SOME of the T2/T3 drum sounds are lifted from the MoES series, but darn few, I'd say. Certainly not an entire kit. T3 claims a few sounds are lifted from their electronic drums too...
The reason I still hang with my G70 is that all of the V-Drum kits have three or four layers on all the primary sounds - kicks, snares, toms, hi-hats etc., and usually two on most others. Plus they are sampled with a bit of 'room' around the sound, that makes it sound more 'live' rather than studio 'tight' (which isn't really the sound of a real drummer).
Roland's V-Drums are the market leader in electronic percussion. To have 'drummer approved' sounds in an arranger helps enormously, IMO...
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An arranger is just a tool. What matters is what you build with it..!