Good exercise to work on. Few minor comments:
Bad news:
- If the Leafs use Horton's LTIR in 2018-19, then they will have bonus overages of well over $5 million to deal with in 2019-20, so need to work with $5M less at least.
- Leivo won't sign to be around as a reserve, play him or lose him.
- Aaltonen has KHL option, he won't sign for $1M. He will make $1.75M this year if he gets his bonuses.
- Realistically Timmy will need 2 years in minors and start at 3rd pair in 2019-2020
- Need better than a 4th round pick for a team to take Marleau.
- You need to add one more to roster.
- Take a peek at 2020, be sure there is a plan to handle expiring RFA's

Good news:
- Kapanen likely signed for less (look at Brown)
- Gardiner likely signed for around 6.


-

I am by no means a genie, or able to tell what the future holds buuut I would think:
-Matthews probably gets 80M/8yrs same as Eichel
-Nylander, I would hope would take the Ehlers deal (6M x 7 yrs)
-Depending on Dermott, Borgman development (which looks good so far) it might be time to lose Gardiner OR hopefully sign him for a bit less

Kinda hopeful with that Marleau trade. Why would Marleau agree to go to a probably a non playoff team from a team which is going to have a playoff run. I would think Borgman and Rosen get more. $$$$. if they are good NHLers. Gardiner might be not affordable for the Leafs. Bozak at that price and term may to much for Leafs to afford too.

Billus is right regarding the bonuses that isn't reflected in your post. And one reason Gardiner and Bozak likely aren't Leafs is because of the signings of players coming off their ELCs.