I think it pertinent that you identified the focus on how LF and TC are different. They are absolutely different. One an immortal entity .. one mortal .. and the differences progress exponentially from there.
Not sure about TC hoping to teach LF something .. but definitely TCs embracing somehow all that LF is .. is a rather jarring concept. From the POV of their variable differences particularly. But in the Land TC is capable of being more than he was ever in our world. So theres that.
The wild magic power that TC was able to access and exercise from white gold and EVERYTHING ELSE that shaped his capability in the Land ... I guess that enabled him to finally absorb LF .. but teach him?
LF has existed for generations of time .. what could TC possibly teach him that would affect actual change in him? Change in his ultimate drive to escape the AoT?
What would TC teach him?
The mere fact of absorbing his essence would offer the necessary degree of containment .. but would it make LF teachable? Changeable?
More than likely the affect of absorbing his essence would force it to be combined with a different dynamic that likely has never been part of LF throughout his entire existence.