To me drafting talls is very high risk, and maybe the PP ( Pelchen Plan ) is to build a gun midfield and get a tall forward by other means .
2005 Josh Kennedy - Yes -Became and effective forward in his 4th season
2006 lleuenberger and Gumbleton - cruelled by injury, Mitch Thorp, still available if you want him.
2007 Kreuzer , Henderson Kreuzer was an effective ruck fairly early, not so much a forward.
2008 Watts, Naitenui, Questions still being asked on both of these players.
2009 John Butcher , 5th season and we are looking for his arrival.
2010 Sam Day - didn't quite work out as planned ( so far ) Tom Lynch -seems to be good for a goal or 2.
That's the issue, you go trading big to try to get these guys you can throw the baby out with the bathwater.
And if we are talking 2017 , even a good pick will be just starting to be viable.