Pretty good SG.
Before entering into the substance first a terminology clarification:
In the FMA consistent use of terminology between different systems is permitted only to the extent that it enables maximum confusion when terminological usage is inconsistent.
Thus for example, in DBMA an "umbrella" is a palm up parry that roughly mirrors a roof block-- a usage unlike other systems.
With the metronome training, there is the "feeder" and the "fighter". (This complies with the criterion of maximum confusion for those of us who also train in Sayoc.) Thus when it is time to exchange roles I will say "Feeder fights, fighter feeds."
By training with rhythm we:
1) allow unequal skill levels to work together
2) give honest feedback of coordination
3) develop rythm, the antecedant to timing
4) research ideas.