No, not backwards at all. U.S. side leads, and the arbitrage trade insures that the Canadian side is kept in sync with any fluctuations in the exchange rate. This has been a pervasive and consistant phenomenon for all duel listed stocks going back many decades.
As for ECA, didn't say I'm buying here today. Not a terrible entry point for your average investor but I'm looking for a little lower before jumping in again...lots of other fish to fry right now in any event.