The words mishandled alone show that Hamilton had Alonso's ticket. He is basically saying he had the power to roll him in his fingers like a booger, but the team wanted him to hold back and let Alonso get things easy. It's a good thing Ham did not hold back, i personally thing a WDC should win because he was the best driver in the right car. He should not be granted a championship, much less with the clemency of a rookie teammate.
A 2 x champ should not be able to be handled or mishandled. All other drivers should be at his mercy, not the other way round.
When i hear Ham talking about handling Alonso, I just

that's how you know he's above Alonso. You think anyone could speak of handling shumacher in any way? blasphemy!
In short Hamilton went there to fight as hard as he could. He did not think he would be held back to let someone slower walk away with something he has dreamed of since childhood. That's what he misunderstood, he didn't get the message, since they would not directly tell him a rookie doesn't challenge the no. 1 driver.