Mario Kart 8 local 2-player doesn't support JoyCon Grip

Mario Kart 8 players on Switch have to use one JoyCon a piece in local split-screen mode--the JoyCon Grip isn't supported.

Why is this combination not possible in MK8 Deluxe Multiplayer? I bought a pro controller for this exact reason. : r/NintendoSwitch

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The Grip has 8 lights, could this mean we will see 8 player local co op? : r/NintendoSwitch

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MK8D] During Wireless Play mode when using 2p split screen, you can only use a single Joy-Con or a Pro, not both Joy-Cons : r/NintendoSwitch

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