difference is though, that Jankowski is a much bigger gamble at #21, being your team's 1st rounder, than Kahaira is at #63 in the 3rd round.
Jankowski is a bit of a gamble, sure, but 21st overall selections seldom step in right away and help and a few never develop into NHL players at all. I think that there's a reasonably good shot that Jankowski plays in the NHL, that's all I'm really saying. Taking a bit of a gamble here on a project player like Jankowski with solid potential isn't the same kind of gambling, for example, as going way off the board with a top 10 pick.
And, for sure--Khaira was a great pick and clearly a steal getting him in the third round. Under different circumstances, playing in a different league, I think he would have gone considerably higher in the draft than third round, likely somewhere in the middle of the first round. Jankowski, though offensively gifted, was overlooked because of his size and was probably not on anyone's radar until a belated seven inch growth spurt. The kid is probably still adjusting to his gangly new body. Hard to say, but how he develops depends entirely on his attitude and commitment. The Flames must have really liked what they saw in him.
The draft is a bit of a crap shot after the top 10, and 21st overall players generally don't step right in and help you. It's usually a player that you have to wait on, as the following list of 21st overall selections (from Hockey's Database) will attest to this:
2012 Mark Jankowski 0 NHL games
2011 Stefan Noesen 0 NHL games
2010 Riley Sheahan 1 NHL game
2009 John Moore 86 NHL games
2008 Anton Gustafsson 0 NHL games
2007 Riley Nash 5 NHL games
2006 Bob Sanguinetti 8 NHL games
2005 Tuukka Rask 102 NHL games
2004 Wojtek Wolski 424 NHL games
2003 Mark Stuart 428 NHL games
2002 Anton Babchuk 289 NHL games