This is a little old now and may be cherry picking a bit, but
http://www.birdwatchersanonymous.com/2009/6/22/921049/where-star-level-players-are-found?ref=CBS
and the takeaway is this
"More than any other position, quality top pairing defensemen are found past the 1st and 2nd round. Nearly half (43%) of the top pairing defense in the 2009 playoffs came from the 3rd or lower rounds."
"a smart team should almost always use their 1st rounder on a skilled forward--because the odds of finding one later are remote." (one exception being a highly touted goalie).
?In the 1st round clubs would be wise to focus on elite scoring forwards and maybe a can't miss goalie.
?The 2nd round tends to produce many high impact defensemen.
?The 3rd and later rounds very rarely produce scoring forwards, but many quality netminders, defensemen and checking forwards are available for the taking
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So if you subscribe to that theory, then drafting a stay at home D with your top 10 pick may not be a wise choice. That's not Schenn's fault, but perhaps it wasn't a smart move by management.
Not sure if I subscribe to the theory given Tyler Myers and Victor Hedman, but interesting nonetheless.