Button
could have won the race had he not gone back down to 19th after his wing change. He was only 9 seconds behind Vettel by the end of the race, despite having had to come through 3/4 of the field to get there.
It's academic because the race is over now, but he easily had the pace and was kinder on his tyres. I know he wouldn't have had the same tyre options had he started nearer the front, but then had he started nearer the front he might not have had to pit for damage either, taking that 20-odd seconds out of the equation.
Plus, he would have been in a position to put Vettel under pressure, and we know what always happens in those scenarios...
(JOKE!)
Hell, technically Schumacher had the pace too. His last stint was pretty slow but he was setting fastest first sectors throughout the race. I'm not surprised Schumi and Rosberg were passing people left, right and centre because the Mercedes had amazing straight line speed. Button aside most people were having a job passing the Mercs even with KERS and DRS.
And that was despite Schumacher being about 10km/h slower through Eau Rouge than someone like Alonso, who was absolutely mighty through there all race long.