* Straight from tomorrow morning’s paper, with a topper…-With Ted Ginn Jr. missing another practice today, it’s almost certain that the 49ers’ WR corps will be down to Michael Crabtree, Kyle Williams, Brett Swain and Joe Hastings.Put that up against Hakeem Nicks, Victor Cruz and Mario Manningham, and that is not a plus for the 49ers. That is a massive minus.The weather could alter everything, of course. But it’s not like New York has been playing in a dome–they’ve thrown in good weather, cold weather, middling weather.Eli Manning can throw in the wind and mud, I’m pretty sure. His receivers can run, and they will have the advantage over DBs that have to react and turn.So the NYGs have an advantage. It’s up to Crabtree to balance that out as much as possible–2 or 3 plays might be enough, and might change everything for his NFL career.I think Crabtree, Jim Harbaugh and most of the 49ers locker room know this.—–the column/Is Michael Crabtree, once and finally, an NFC Championship Game-changer?If it happens that way on Sunday — if it’s 49ers over the New York Giants, Crabtree in a starring role — you get the sense that nobody would be less surprised than Crabtree himself.It could come down to this. In many ways, it should come down to Crabtree, rise or fall.Reputation remade; or questions continued.“Every game — my responsibility is big every game,” Crabtree said Friday after the 49ers practice.“I play wideout. I’m the receiver, you know? A lot on my shoulders.”Yes, there is a lot, and especially for this game, of all games.Tight end Vernon Davis was the superstar in the New Orleans victory; you would have to believe that the Giants defense will devote extra attention to him Sunday.That leaves the 49ers’ receiver corps as Alex Smith’s main option. And if Ted Ginn Jr. is limited or out with a knee injury, that group would be down to Crabtree, Kyle Williams, Brett Swain and Joe Hastings.Spotlight on Crabtree, right there. But in that New Orleans game, Crabtree had almost as many drops (three, by unofficial count) as he had receptions (four for 25 yards and a touchdown).“That’s not normal for me to drop the ball,” Crabtree said. “Two or three drops, I mean, it haunted me. I couldn’t sleep.“But at the same time, you’ve got to put that behind you and go catch the ball. Do what I do.”Which is sort of the point here — what has Crabtree done in his three 49ers seasons since they took him with the 10th overall pick in the 2009 draft?Notably, after some bumpy times, Crabtree has been a model teammate this season — and he made the huge leaping 41-yard catch to set up the 49ers’ game-winning score over Seattle on Dec. 24.“There’s probably a couple of plays in that last game that he’d like to have back, but there’s stacks of them that we’re very thankful he made,” offensive coordinator Greg Roman said.“He saved Christmas in Seattle. He competes hard. Michael is doing a great job. Expect big things out of him.”They need big things out of Crabtree and have wanted them for years. But so far in his NFL career, Crabtree hasn’t been anything close to an ideal No. 1 receiver.For instance, both Hakeem Nicks and Victor Cruz of the Giants have much better stats this season than Crabtree, and all three of their WRs — including Mario Manningham — have higher yards-per-catch averages.Of course, the 49ers don’t throw it nearly as much as New York does.But the fact that there are only a few significant Crabtree plays for the coaching staff to underline is indicative of a different kind of performance level thanoriginally expected.“Anything to make the team better — blocking, catching the ball, trying to get (yards after catch), being a decoy, however you want to call it,” Crabtree said.“We’ve just been doing our job.”Crabtree had 72 catches for 874 yards in the regular season (12.1-yard average) and scored four touchdowns. Those are possession-receiver numbers, not No. 1-type numbers.Crabtree, who doesn’t have premium speed and doesn’t often get separation from defenders on routes, also has only three 100-yard receiving games in his career, one this season.“I had an OK season — good enough,” Crabtree said. “I feel like whenever they needed me, I came through.“I don’t really look at my stats, I look at the record. My goal is to win a Super Bowl. I’m just doing whatever it takes to win.”Not surprisingly, that’s how Jim Harbaugh views it, too.Essentially, Crabtree now fits into the team’s entire mindset. He’s a blue-collar receiver on a blue-collar team.After all the fireworks of his college career, Crabtree has folded into the whole Harbaugh philosophy — do your job, the team wins.“Michael’s had a 14-3 year as a receiver,” Harbaugh said. “All of our receivers have had that kind of a year, in terms of executing their job.“We’d love to see a big game from Michael in this game, like he’s given us in many of the games this year. Hope he has a big game for himself.”The 49ers, for once, really might need that from Crabtree. Not just the blue-collar stuff. Not this time, in this game.The game could come down to him, which, interestingly, is why they drafted him in the first place.