I consider Nurse your transactional cost. He has to go to make the money work and he's not a controlled asset, plus he's basically losing his spot. If you need to dump Larsson, do it somewhere else. He is of zero value in the trade. The Coyotes can take him, but he doesn't count for or against any value. If you feel bad about that, don't put him in the deal and get some value elsewhere.
The base' is really OEL+Fischer+Hall's rights for Nurse, Broberg or Bouchard, 2020 1st.
If you want to juice the deal from there, you can. The Coyotes will take additional dumps. Larsson for free, or you can start adding assets in for Kassian/Russell. If you want Crouse AND a dump, the add better be of value.