I think the Cavs should target Jonathan Kuminga as Plan B if they miss out on LeBron James. It'll most likely take a sign-and-trade, but Kuminga's athleticism, defensive versatility, and upside make him a great fit with Cleveland's young core for years to come.
I think the Cavs should target Kevin Love because this could be his final NBA season. It's been rumored he'll most likely join LeBron James wherever he signs, and bringing K-Love back to Cleveland would add veteran leadership, shooting, and a meaningful reunion.
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Finishing: D
Mid-range: A+
Threes: A-
Passing: B-
Ball Handling: C
Rebounding: F
Post D: C-
Perimeter D: B+
Athleticism: B-