The Rangers drafted Lee Falardeau in the 2002. His teammate at Michigan State was Duncan Keith. Fox Sports Detroit carries the Michigan State games. I remember watching a few games early that season on DIRECTV before Keith left for the WHL in 02-03. He wasn't anything special. Keith spent two full seasons in the AHL. Look at his offensive numbers in the AHL and in the NHL leading up to 08-09 which was his first 40 plus point season in the NHL.
http://www.hockeydb.com/ihdb/stats/pdisplay.php?pid=63187
McDonagh had 32 in his first year. 19 in 47 games last season. Keith had 27 in 47 games last season. 10 of those points were on the PP. 2 goals. 8 assists. McDonagh had 2 PP assists in 11-12 and 1 assist in 13.
With more PP time,Keith's numbers went up. Same thing with McDonagh. He is on pace for 46 points.
http://espn.go.com/nhl/player/stats/_/id/2306/duncan-keith
http://espn.go.com/nhl/player/stats/_/id/4954/ryan-mcdonagh
In the finals,Keith was double shifted. Chicago didn't trust Leddy so they had Keith with Seabrook. Then it was Oduya-Hammer. Followed by Keith-Rozsival.
McDonagh has already proven he can handle the heavy workload in the playoffs. How many minutes did he play in game 3 2012 against the Caps?
Keith isn't a pure offensive defenseman like Karlsson. Same thing with McDonagh.
Ryan is 6 years younger. He is 24. Keith won the Norris 2010 when he was 27.
The sky is the limit for this player and some people can't see it.