How can you with (very limited minutes) accurately assess just how effective he'd be? How much has he played with a pivot the likes of Sid, Geno and even Brassard combined? My guess here is not much! There is not enough conclusive evidence to say what the hell we have here or not. With ZAR, Simon and such there is at least a lot more data.
You're still confusing the issue. Crosby and Malkin boost pretty much everyone's numbers, but why would you put someone on their line who's poor defensively, who's offense is questionable, who brings you nothing away from his production and overall has been playing poorly? Especially when in the very limited sample size you do have, 2 of those 3 (which account for ~90% of your sample size) show that those centers are better players away from him.
And yet that hasn't stopped some from talking about how great he'd be if only he was gifted 5-10 games stapled to Malkin's wing, regardless of his play, production or how we did those games (yes some have said exactly that).
Here's the thing. Most are not saying what he will or will not be at some point down the road... we're saying what he is today (or more accurately what he was up until Nov 16th). And aside from the last four games which were very good, he's been largely meh, that doesn't provide anything other than his offensive skillset, and even that's been rather questionable. IF the last four games are the measuring stick, then he's certainly turned things up several notchs. But the idea that he should get a pass on his poor play because of who his linemates are is idiotic in the extreme - again look no further then his last 4 games... Still had crap line mates, but his play (despite some of the numbers) was actually very very good.
If he'd played like he has the past four games all season, and still only saw around 20 minutes with Crosby, Malkin or Brassard, then after 16 games, there would be a pretty legitimate bitch about that and what a disappointment it is. But he hasn't. He's played like crap for a large portion of those first 12 games, and yet there's still some crying, well if he was only playing with a star, then he wouldn't be playing like crap. It's bullshit. It's Eric Tangradi and the "give him 20-40 games on Malkin's wing to sort it out" all over again. That was shit then, and this is shit now. We desperately need to win games, and until extremely recently, Sprong's play didn't deserve any sort of promotion into the top 6/9.