Yeah Leitch-Smith is someone I've mentioned who seems a really obvious replacement for MacLean, but I don't see him enough to notice any weaknesses.
I sort of hope we don't outright replace MacLean, we have Scougall, and potentially Williams, who thrive in the space between midfield and attack, for some reason MacLean has decided that's the area of the pitch he wants to spend all his time in so he just swamps them. I doubt we'll ever see the best of Scougall/Williams, if we can't give them space to operate.