Pretty sure over the phone the director told me nothing but vocals would be amplified.
But, yeah with a premixed stereo soundboard feed I could scrap the idea of a dedicated vocal track. In fact, with only 2 line inputs I'd have to. But what are the odds a soundboard feed (if present) would be mono, and presumably not desired to mix with my mics? Any clarity I gain would come at the cost of a more collapsed stereo image, yes?
We're entering a lot of hypothetical here for this event but I enjoy learning what I can, thanks!