Theodore is a lefty though, which doesn't really fit the mold of what AV seems to really want, LH/RH on each pair. Otherwise you can just move Sanheim, Ghost, or Hagg to the right side without making a trade. Plus, I'd expect Vegas wants no salary coming back, which would make things dicey on the cap in this direction.
And for those that worry about these things (I don't), Theodore's contract extends past next season, so that means you now have Provorov/Sanheim/Myers/Ghost/Theodore that you need to decide amongst for expansion.
I'd be interested to see if St. Louis is open to dealing Parayko in order to get under the cap. Had a bit of a down year last year, but is a righty, makes $5.5 million for the next two years. But St. Louis could take some money back, so if you send them a Hagg/Raffl/Laughton the other way to make the money work on this end it will work for them too.