The problem with most arrangers' organ sounds is that few of them are sampled utterly dry, off the pre-amp. Most of them have some chorus or slow Leslie sampled in, and running this through a Leslie is sort of a double whammy, leading to a hollow, phasey kind of sound. Plus, of course, few but the pricier ones have proper single trigger Perc. sections that rob the 1' drawbar. And again, the few that DO have semi-decent Hammond 'clones' built in (including my G70) rarely can route that ONE part out to a separate output to send to the Leslie alone...
Be nice if they did..!
Then again, who are we kidding? No-one's willing to tote a 45 lbs. arranger around (except me!), let alone a 149 lbs. Leslie!
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An arranger is just a tool. What matters is what you build with it..!