Something that has not been mentioned but is NOT a small detail is that Kakko and Lafreniere are both exempt from the expansion draft. Many other teams are going to be losing key players or need to make moves to protect key players but the Rangers have the ability to not need to protect either of these guys. That's a big deal.
As far as moves, I'm still thinking Buch is the guy to move IF they can re-sign Fast. To me, Fast @ ~$3m per season makes more sense based on what is in the pipeline on the wing, the contracts and Fast's ability to be that utility knife guy the team will need as these players develop. It's been bandied about a bit but something like Buch + Georgiev for Nurse would be ideal.
I'm laughing a bit at myself here but I find it ironic that with the draft lottery occurring last night, I find myself more thinking that it may make more sense to sign Strome to a 3 year deal (ends right when Lafreniere's ELC is up) as long as there is not any sort of NTC or NMC included. Have the assistant coaches work with Strome and Chytil regularly on defensive zone situations/video and develop those guys.
With the addition of Lafreniere, I am LESS inclined to buy anyone out at this point. I'd bite the bullet for next season as needed (hopefully with some help by Hank retiring and Smith being traded) but in no way would I want any further 'dead' cap space.