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Yeah, I know it may sound like the weirdest thing in the world and why in the heck I would be arguing a "crack pairing", but let me tell you that its not as cracky as it seems. icon_3nodding.gif
First of all, I'm a firm believer that Gaara is a very straight character, so GaaLee and GaaNaru are no-nos to me. I'd argue why, but I won't bore you with that. And since I'm not into incest, Sakura is the only girl he has actually -met-, at least in the series. Remember that scene in which Gaara crept up on Sakura but didn't attack her? I don't really think it was made to add tension to the episode, Kishimoto could have easily done something else, but he didn't, so you have to wonder why that happened because it seemed really random. Second was the part of Gaara's past in which Yashamaru mentions someone to heal Gaara's heart. This can be seen as foreshadowing as Sakura becomes a medic nin. Wait? Wasn't it Sakura who made him remember? She must have been a good impact on his life to make him remember that (even if Naruto did help), especially when Gai could have done exactly the same, but didn't. Hint? Maybe.
And in the Gaara Rescue ARK, who was the one that showed she had power? Sakura was by killing an Akatsuki member even if she had help. It could have easily been Naruto or if Kakashi and Naruto would have killed Deidara it would have had the same effect, but he chose Sakura. Hmmm, kind of suspicious if you ask me.
Lastly there's the similarities to DBZ (Which Kishimoto fanboys), in which there are a bajillion already. The NaruHina pairing is a lot like Goku/Chichi and the Gaara/Sakura pairing would be a lot like Vegeta/Bulma. As in the girl being the close friend/older sister to the main character and the male character being a sort of parallel to the main character that was once evil but then became good. A lot of SasuSaku-ers claim that its Sasuke that's parallel to Vegeta but Gaara has many more parallels.
"They're nothing alike!"
Hell, anyone could argue the exact same thing on NaruHina. They're opposites too and yet Hinata's feelings for Naruto are real (see essay/rant above). If Kishimoto already started on one opposite-attract couple, I can't see why he can't put another one such as GaaSaku? A sadist pairing? No, I don't think Sakura has so little self confidence as to have a guy boss her around all the time, which is why I think she could handle a guy like Gaara and why the GaaHina idea doesn't appeal to me.