I mentioned it earlier, didn't get much response on it.
As far as the UFA thing, I can see where Aslan is coming from. Sign and trades in the traditional sense dont happen but theres usually an extension in place from negotiations with the new team. I think that's kind of how we are running it, a signing is brought to us after a trade has been agreed upon.
My issue here is that it simply doesn't happen in the NHL (especially in the offseason)
2009: Florida trades UFA Bouwmeester for UFA Leopold + 3rd (Both teams sign the respective UFA, Leopold after free agency starts)
2010: Phoenix trades prospect Jared Staal to Carolina for a 5th (Re-signs, only plays 2 games in the NHL)
2010: Nashville Trades UFA Hamhuis + conditional pick to the flyers for Parent. Flyers can't sign him, so they trade him to Pittsburgh for a 2011 3rd, he walks from Pittsburgh too and signs in Vancouver.
2011: Montreal trades UFA James Wisniewski to Columbus for a conditional 2012 7th (Wiz re-signs in Columbus for 6 years, the pick gets upgraded to a 5th)
2012: Detroit trades UFA Stuart for Andrew Murray + conditional 7th (Stuart re-signs a week later)
2013: Ottawa trades UFA Gonchar to Dallas for a conditional 6th round pick (Gonchar signs with Dallas the next day)
2014: Capitals trade UFA Halak to Isles for a 4th (Takes a month for Isles to sign a contract with him)
2015: Boston trades UFA Soderberg to the Avs for a 2016 6th round pick (Avs sign him the next day)
2015: Sharks trade UFA Niemi to Dallas for a 7th (Dallas signs a couple days later)
Historically, regardless of whether there is a signing UFA rights have next to no value. If there are outright sign and trades, I just feel that there will be some belief that there should be a legitimate return which in itself is unrealistic based on how the NHL functions.
(I might have missed some, the article I looked at was prior to 2016 Free Agency. I don't recall any in the past 3-4 years that would counter the trend though)