Greg responds...

1. Um, it's pretty much what you listed above. It didn't really matter who we recorded first, so that was based on scheduling. If Kevin was in the recording booth first, we'd record Nabu first. If the host body actor was there first, we'd record him or her first. If they were both there, it was sort of Voice Director's choice. We then played the take from whomever recorded first for the second actor, who attempted to match the basic cadence and tempo. But we consciously chose NOT to have the second actor try to match the first exactly. We like those moments when they aren't perfectly aligned. Then during my attended edit of the dialogue, we'd lay those tracks over each other for storyboarding and animation purposes. (It helps that the Helmet of Fate doesn't reveal any lip movements, that might cause confusion between which track to animate.) Finally, in post-production, specifically at the mix session, we'd mix the tracks so that you can hear at least a taste of both flavors.

2. Uh... I don't know enough about smartphones to answer that question. I wouldn't know how to record one track on my smartphone, let alone two, let alone know whether or not I could double track 'em onto a single track.