Who adds what?
Joined: Jul. 2017
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I'd hesitate to trade Burakovsky at 23 for Kovalchuk at 35, straight up, at even cap hits. It helps this year, but hurts the next four through eleven. Since Kovalchuk is signed three years, it especially hurts as Kovalchuk declines further and gets slower and more injury prone. It's a fun idea, and he'd provide proven depth scoring this year, but you've pencilled him into Washington at almost 4M through his 38th birthday.
Johansen or Kempny should be almost enough for Zadorov, if he's available. If not, no worries.