Broadly speaking I think there's an argument to be made that the Leafs could be better offensively from the back end. Probably why they are interested in experimenting with RHD Mitch Marner in some facilitating, maybe positionless overload play. Colorado's offense was really supercharged with guys like Toews, Girard, Byram chipping in beyond Makar, for example.
Again, not sure if Chychrun is that guy. He does have an excellent point shot which the Leafs have been missing for a long time, but agree with you what is the acquisition cost?