@Octogon:
He thought blueno could handle gear 2, but he obviously couldn't. Luffy probaley wanted to finish the fight as quickly as ps=ossible while testing out his new moves.
But you're stating that Luffy didn't NEED the gears to beat Blueno. That's where I'm questioning you. Why would Luffy use them if he obviously didn't need them? I'm sure it's because Oda wanted to show us the gears but then why didn't he just do it when Luffy faced off against Lucci?
Blueno wasn't even using his full power against Luffy as others have said but make no mistake. Luffy definately needed the gears to win.
@Octogon:
How do you know he wouldv'e done so? Luffy wants to get to robin as soon as possible. And he was pretty much owning Blueno without the gears. So how do you get the idea that he NEEDED the gears to take care of blueno?
If he was pwning Blueno without the gears then I ask you again. Why would he need to use them? I'm pretty sure Luffy could have finished the fight quickly without using the gears if he was truly "pwning" Blueno.
After all look back when Luffy knocked out Bellamy. He didn't even need to use any Gomu Gomu attacks. Which shows that Luffy doesn't just bring out new techniques when he feels like it. Only when he needs to use them.
Actually it looked more like Luffy was having difficulty defeating Blueno even with the few hits he got on him before using the gears and this was before Blueno even got serious.
If Blueno had been completely focused and serious he would have decimated Luffy if Luffy hadn't pulled out Jet Bazooka.