Just make him more cocky. There is no doubt that Hamilton/Mercedes is the best combo on the grid. Is he the best driver? Hard to say what Seb, Danny, Max could do in a Merc. Merc is certainly the best team. They have consistently fielded the car with the best combination of power and handling over the last several seasons. When they hit a problem, they always find a way to stay in front. If Honda continues their remarkable improvement, Max may be able to threaten them by year's end. I am most impressed with the progress Honda has made in power and reliability. For me that's the real story this season.
Always hard to pick the 'best driver'. I would make the case that Lewis is the best driver on the grid right now. He rises to the occasion and puts in 'perfect laps' like no one racing right now. He's not making the mental mistakes. He's not overly aggressive, he's not driving conservatively. We can argue about driving skills, but there's no one with the fortitude that Hamilton has.
Certainly Max is developing into a great driver, adding maturity and patience to his daring attitude. I wasn't sure if he'd develop into a champion, but I think he might.
Similarly, LeClerc has shown he belongs at Ferrari, which means he's a championship calibre driver. Having a rough season, dealing with bad luck and team troubles will teach him a lot. If he's willing to learn, this season is going to be the foundation of his championship years.
Vettel has the skill. Always able to find a little bit extra from his car, always able to find a little bit extra from the track. He just never seems to be reliable when the pressure is on. Not to say he hasn't put in clutch drives where he manufactured a win, he just doesn't do it as well as others.
Further down the grid, Perez, Hulkenburg, Ricciardo, they've shown they could win with the right opportunity, and while it takes luck to get those opportunities, it also takes a certain championship drive to sniff out and seize those opportunities.
Of course, Kimi is something else entirely. He is the embodiment of F1 racing. He doesn't have the killer instinct of a champion, but he has the soul of a racer, more so than anyone else on the grid. (If fate had been kinder, maybe Kubica)