Dynamic occlusion question

[ttpharm]

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In a non-working movement, which structure of the maxillary 1st molar moves through the distobuccal groove of a mandibular 1st molar in a class I ideal occlusion?

My answer was Distolingual cusp, however DBM's answer was distobuccal cusp.

I keep thinking its distolingual though so maybe my thought process is wrong. Can someone chime in?

 

[ttpharm]

It has been answered. The answer is distolingual