I think from Edmonton's perspective we're a good place to try to dump Lucic. Big spending team, not trying to contend in the short-term, crystal-clear cap situation in two years. We don't desperately need a huge guy who sucks, but there have been posts on here calling for Ryan Reaves for example. If there's any place at all for those guys in the league it's on the fourth line on a team of 20 year olds.
But all those expensive defensemen we can use as make-weights have no-trades, and there's no reason for Kreider to re-up. And yeah, the "Kreider and McDavid will have great chemistry because both guys are fast" thing is a big simplification