On SPT, which includes a ratio of AEA/nonAEA cast, producer doesn't always pay a nonAEA dance or fight captain, so one bone of contention is, are they choosing the nonAEA because they don't have to pay them. But I truly believe the choreo or fight choreo should be the one determining who belongs in that position, esp in shows where the AEA leads may not be dancers at all, or if they are dancers, their rehearsals were at the same time as the ensemble did choreo/blocking, so they never learned it. In mixed casts the best dancers are often the choreo's asst who is cast in the ensemble, or the nonAEA chorus folks who were specifically cast for dance ability. So to me, it is the logical best choice to be dance captain.