Hi Big Knight, lol...
Sorry to say, but you are a little confused on the subject.
You are simply stating the obvious, that the variation in price for ECA between the two exchanges comes from the movement in the Canadian dollar versus the greenback.
That is what happens each and every trading day of the year for duel listed stocks. If the Canadian dollar moves lower tomorrow you'll see the opposite effect of course. But the point you've missed remains...the U.S. side leads, and the Canadian side will adjust its trading interday via arbitrage to reflect the prevailing exchange rate at any given moment.