To the extent that ND's issues in the lane involved competing with ultra-tall centers like Beers, that rests on Koval's shoulders.
Before yesterday, ND had exactly two posts (I think Prosper could play the 4, but that's another story). So at least Karlen gives another productive veteran option. We'll see where she lands on the Sheperd-Dodson-Ebo transfer forward continuum. At the very least she is an upgrade skill-wise on Watson, though a downgrade size-wise.
ND loves nothing more than a white finesse power forward standing approximately 6'2 to 6'3 (e.g. Brunelle, M. Westbeld, Boley).