Some say that the club should only be across the line... if the club goes beyond parallel to the ground. He is across, and is no where near parallel here. This is going by the definition that for the shaft to be on plane...one end or the other is either pointing to the line the ball is on, or parallel to that line.
Now... there are many good players that do not conform to that rule in certain parts of their swings(strokes). Greg Norman is similar to Clark, and Jack Nicklaus gets across, as well as Larry Nelson, and many more. Others, are what is called "laid off"(Brent Geiberger, Brett Wetterich).
In theory... less compensations, the better, but if a player is consistently delivering the club on plane... sometimes it is better to leave them alone.
He does have broken motion when he swings, get his right arm in the right spot it would LOOK better. Does not say he would play better from there however. I guess you would call it a pitch right elbo in your terms.
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