How far do the properties of exchange stretch? We know from T2 that Lost Souls exchanged also exchange "the one selected for rescue." What other sort of things get exchanged?
For example, if Jacob bands to Angel under the Oak who exchanges with Moses, what happens? Jacob's band is Negated, but will Moses stay because Jacob didn't band to Moses, he banded to Professor Oak? Will Moses have to leave because the exchange took place before the band was resolved, therefore making Moses the banded-to character? Would Moses become the banded-to character simply by virtue of exchange?