Why not make Garen E gain spins per level rather than flat damage?

Make his AD scaling on his E scale up per level rather than per rank. The way his E is right now is it barely gets stronger per point in E but stronger by his actual level. Say at rank 1 his E has 4 spins. Rank 2: 5 spins. Rank 3: 6 spins. Rank 4:7 spins. Rank 5:8 or 9 spins. Have his E damage scaling get higher per champion level than per E level. Thoughts?
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