Available cap space is double edged.
If a team has spent 6 million on a player already there is the potential to turn that into 3 million in cap space through the use of retention.
Beauvillier is a FA this year, at cap hit of 4.1 mil. So his contract has higher value because it ends soon.
A team like, let's say Washington who are capped out but wanting to support Ovechkin's pursuit for the goal scoring record, might be willing to take both Myers AND Garland/Beauvillier if 50% retention for 2 1rst round picks or Mantha and a 1rst round pick. Myers @ 3 mil plus Garland @ 2.7 mil/Beauvillier @ 2.05 mil equal Mantha's 5.7 mil cap hit. So a good move for Washington. Dollar in dollar out almost.
Or Garand with 30% retain and Beauvillier with 50% equals a little over 6 mil for Mantha and a 1rst.
Now this is only working the cap with one team. This could be done with a lot of teams, more as the season goes on.
BUT it would take a management team that can add and subtract. I say that because when odds makers and historical data show the odds of making the playoffs are minuscule, which is much earlier than the GM's want to tell the fans (because the fans will stop coming out to watch losing if the team is doing something to be better the next years
).
This kind of deal Myer and ? to Columbus. Penquins. How many want depth at the TDL.
The cap DOES make trades harder, not impossible.
In Vancouver the evidence is the owners are willing to spend multi millions to buyout a player so smaller shorter term payments should not be a big issue.
I could come up with a trade with just about any team