Grabner: 6'0", 185
Upshall: 6'0", 200
Those 15 pounds can be accounted for by the fact that Upshall's 4 years his senior - not that it's really important, anyway, as it relates to Grabner's game.
Those 15 lbs can also be accounted for body type. Grabner has a lighter frame, while Upshall has a heavier frame. If Grabner puts an extra 15 lbs on to his frame he's going to be overweight. This will not help his conditioning or his speed. And it is important to Upshall, because those extra 15 lbs on his frame allow him to be somewhat successful at the more physical style of game he plays.
Heck, look at Smyl. He was around 5' 8" and played at around 190 lbs.
Talking about physicality, "hits" is a stat that is totally vague and cannot be looked at with any sort of reliability. I'm not saying that Grabner's physical, but even if Upshall has a load of hits to his stat line, think anyone's scared of him/looking over their shoulder in going to get the puck in the corner? Fat chance.
I suspect that a defender is looking over their shoulder at either of these players but for different reasons. Upshall threatens a body check which could lead to a turn over. Grabner's speed threatens a stick check and a puck steal.
And it doesn't have to be a situation of, "OMFGUPSHALLCUMMINTOOHITZME!!!!!!" A good physical player can also knock the other player down or merely off balance, tie them up in front of the net, break their stride, rub them out along the boards, and if a big hit comes along, then they do that as well. Grabner might be able to do these things. Upshall will do things, and have the physical ability to do them better.
And why didn't you bring up the goals per game ratio? Grabner's 0.34 is over 50% higher than Upshall's 0.23. Why wouldn't he be able to crack the top 6? 54 goals in the last 2 years as a 23/24 year-old say hello. He's done his job.
I revisit Smyl. He had a goals per game ratio of .29 and a points per game ratio of .75 over his 896 games. He was maybe not even as fast as Upshall let alone Grabner. So, would you take Grabner or Smyl (assuming Smyl was in his early prime).
I also note that you slide over the fact that Grabner had a very serious drop-off in goal production last year, and a very abrupt rise in his +/-. This drop-off in goal production is of the same level as Raymond. Just saying.
Oh, and let's not forget that he was the NHL's fastest skater at the 2011 ASG.
Yeah, and in four years time, when he's 15 pounds heavier, I'm sure Grabner will still be the fastest skater in the 2015 ASG, assuming he gets a head start.