His ceiling is basically another Crosby, but you couldn't reasonably expect him to be that.
If Mike Trout is the ceiling of a hypothetical #1 super prospect in baseball, then Bryce Harper to date might be the reasonable projection.
Ben Zobrist is Bergeron. Check the WARz over the last 3 years for that analogy.
But, I can't see EDM trading a guy who has a Crosby/Trout ceiling, even if the trade makes sense in the world of likely outcomes and projections and spreadsheets.