Lupul was a 0.57 PPG player before joining the Leafs.
JvR was a 0.51 PPG player before joining the Leafs.
Clarkson was a 0.4 PPG player before joining the Leafs.
Franson was a 0.35 PPG player before joining the Leafs.
There's nobody in this line up who was a big time scorer before joining the Leafs outside of Kessel and Phaneuf. All the other guys have had their first real success here.
Clarkson hasn't even joined the team yet so he's irrelevant.
JVR and Franson both experienced expected boosts in production from increased minutes and PP time. JVR was a 40-45pt pace producer in ~14mpg and secondary PP time with the Flyers, and has been a 55-60pt pace producer in ~19mpg and primary PP time with the Leafs. Franson was a 30-35pt pace producer in ~15mpg and secondary pp time the the Preds, and has been a 45-50pt pace producer in ~19mpg and primary pp time with the Leafs. None of that is unexpected.
Lupul is the one example which you are right about. His scoring has jumped a huge amount as a leaf for no apparent reason. Possibly just a shooting percentage effect, though he always had a good sh% before. You ask him, and he credits his career turnaround to new workout regimes, skating techniques, and huge work ethic increase after his back infection almost ended his career.
But regardless, even looking at career scoring numbers, this is a team that is going to be a good scoring team, no matter what.
Career 82gm paces (Last 3yr paces in brackets):
Kadri (23): 22gls/53pts (27gls/61pts)
Kessel (26): 30gls/62pts (36gls/85pts)
Lupul (30): 26gls/53pts (37gls/85pts)
Bozak (27): 19gls/46pts (21gls/51pts)
VanR (24): 23gls/45pts (28gls/53pts)
Clarkson (29): 19gls/33pt (29gls/45pts)
Bolland (27): 18gls/42pts (20gls/39pts)
Raymond (28): 18gls/40pts (18gls/37pts)
Kulemin (27): 17gls/41pts (10gls/36pts)
Phaneuf (28): 15gls/46pts (14gls/45pts)
Franson (26): 8gls/35pts (7gls/43pts)
Gardiner (23): 6gls/30pts (6gls/30pts)
Rielly (19): 0gls/41pts (0gls/41pts)
Ranger (29): 5gls/28pts (0gls/16pts)
Gunnar (27): 4gls/25pts (3gls/23pts)
Even if you believe that the recent surges in Kessel, Lupul, Kadri, JVR, Franson are flukes, this team will STILL be a good offensive team even if they regress to league averages. Of course, I don't think it's smart to think that young players like Kessel, Kadri, JVR, Franson will regress to what they were as 21 year olds, and we should probably just accept that they are very talented young kids coming into their own.
Lupul does stand out as the one fluky looking guy.....but I have a hard time believind that anyone who watches him play thinks he's gonna be slowing down any time soon.
I have a lot of respect for the Shot Metrics, and it is absolutely true that most every high scoring team also puts up lots of shots. There is no arguing that. This does not mean, though, that the stats are perfect, or even really close to perfect.
You see, the Leafs aren't the only team in the league that has been able to be an elite scoring team this year and last despite low shot numbers:
12-13
TB: 3.13gpg (7th), 26.8shpg (26th)
TOR: 3.30gpg (5th), 25.9shpg (30th)
11-12
TB: 3.06gpg (3rd), 27.6shpg (24th)
TOR: 3.02gpg (6th), 26.3shpg (28th)
Nobody is going to predict that the Bolts' scoring will drop off, because everyone is willing to acknowledge their elite offensive talent.
The difference is that everybody is afraid to acknowledge the Leafs' scoring talent for some reason. They just can't get themselves to admit that the Leafs' have elite talent players.