For someone who isn't A-grade, he's doing quite well for himself with the talents he has been given. At the end of the day, everyone seems to agree that he isn't going to be able to attack and solo to the line.
So why would he do it? Why would he risk his career with a tactic that is stacked against him. I'd do exactly the same as him if I was in his situation. He knows his abilities, and plays to them.
Yeah, it isn't exciting, yeah, he is a one trick pony. But it is a pretty good trick considering his results. He still needs to make the distance with energy, follow the decisive moves which takes some skill in itself, and kick at the final.
He's done it enough for everyone to be wary of it, but they aren't. Or they aren't good enough to drop him earlier in the race, or they are just stupid. Either way, its up to the others to stop him, not for him to stop himself.