Webber? lol, his luck wont let him.
None of those driver's cars are anywhere near the McLaren this year, so Kovalainen better have some really bad luck and some bad driving to allow any of them to overtake him in points.
If you've noticed, hes been overtaken by most of these drivers in races, but not always the same drivers, they are battling each other for points and that McLaren is usually at the top end of it.
The only likely person is either Alonso or Trulli, as they are the only drivers consistently scoring the bigger points or at least qualifying well enough.