I struggle to view a 12 feet tall Balrog (with associated flame and shadow) operating as a stealth assassin. This just doesn't resonate with their MO in any version ie the pre-Maiar dragon riders, or revised Maiar (only 7 ever in existence) version.
I do think we have to consider that the Dwarves simply had no potent counter to the Balrog's huge sorcerous power, massive physical strength and capacity to make most opponents flee through sheer intimidation.
With regards to Gandalf, to sum up my earlier position: simply because I can defeat my friend's enemy (even if he can't), does not mean I can defeat my enemy.
That said, uninhibited by human form, I wouldn't be surprised if any of the Istari could single handedly go to war with a Dwarf army. The Balrog has no imposed inhibitions, it is what it is, raw in its power.
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