I think the issue is the player's Delivery Line. The general principle is to move parallel to the Delivery Line in the Downstroke. If using a straight Delivery Line (Plane Line or Angle of Approach), then you would slide parallel to the Delivery Line before it becomes a turn. If using the Arc of Approach, you would turn and not slide.
When using the Arc of Approach, the CLUBHEAD travels in an arc, but it still points to the straight plane line per 1-L-6.
Also see 2-J-3 in this respect.
Per 7-12 "All motion - Pivot and Power Package - moves parallel to the selected Delivery Line. That is, prior to the Downstroke Turn, a Slide parallel with either the Angle of Approach or the plane line per 2-J-3."
Delivery Lines are needed to guide the clubhead and right forearm.
Per 5-0 "That - failure to clear the Right Hip (Roundhouse) can initiate almost every alignment disruption, including shanking..."
The point here is no matter what Delivery Line is chosen, there must always be a slide first - for hitters, a cross line motion to stay ahead of centrifugal force per 2-L-1; for swingers parallel to the plane line - else there will be a hip-elbow collision which then necessitates a roundhouse (7-13).
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