Kase is a long shot but worth a gamble. Worst comes to worst I guess you could revisit a Galchenyuk type guy.
With Kase who is only 25 years old, I wouldn't be surprised if the Leafs "red shirt him" a USA football term (sit out/delay return) and place him on LTIR at the beginning of the year with the intention he sits out the entire regular season recovering from his latest concussion.
The Leafs will replace him on the active roster and re-use his cap space $1.25 mil on a healthy player, essentially pushing his cap hit above the hard cap ceiling of $81.5 mil. Where Galchenyuk potential return might be a good guess, or someone like that in that similar price range. (still TBD)
Some of the potential benefits here playing the long game in his recovery process is that he is a very talented player when healthy, so at the end of this season Kase is still an RFA when this contract ends. so the Leafs can qualify him and keep his rights for the 2022-2023 season @ same level. This is all about getting him healthy and not rushing the process as head injuries are tricky and risky and return dates unpredictable.
Best case scenario,

, if he magically starts feeling better, perhaps they attempt a Kucherov, and can activate him for the 2022 playoffs as if he was a TD addition but at no cost but coming off LTIR to build up the Leafs playoff roster when the cap is no longer an issue. Kase is a perfect player to attempt this replication tactic on what TB used this past year to great success and cap manipulation.
This is my best guess at present what the Leafs might be thinking here with his signing taking into account his current injury status, and potential injection into the Leafs line-up down the road when he is back to 100%.
PS. There is no risk here to the Leafs by his signing other than money $$, as I would be surprised if insurance will cover this contract considering he just missed 65 games to injury and counting and his long injury history of 5 documented concussions. So Leafs might be on the hook for the full uninsured contract salary, but who cares its not our money but MLSE.
