If a scholar is clean shaven, eat with his left, miss ŽId and Witr prayers on a regular basis (due to laxness) etc, then I may not recommend someone to take guidance from him in this matter; but that is because he is insisting upon leaving numerous sunan habitually. So while he may not be sinful, he is known to generally be lax in the Sunnah. wa'Allahu aŽlam. wassalam