On second thought, it was rather easy to dismiss the effect in Whale Airship because the first of my parties (-70% debuff) on the ship is the only party that sees action when in the Swanship, so I had no way of knowing if the Rainbow Panel's effect extended to other parties.

Anyway, I also did a test run in a regular stage a while ago. I can confirm it worked the way Ghostmon stated. My bad then.

Wutan: I can barely manage to finish 1 lineup with the units I like myself, and you're on the way to building your 10th? Man......