Perhaps Button didn't force Hamilton out of McLaren, perhaps it was their inability as a race team.
As for Hamilton and Button's 6 point difference in 3 years, that's really close. However I will say that includes what many people consider to be Hamilton's worst season to date and Button's best, I'm merely making an observation here don't shoot me. Although the result speaks for itself .
Jenson has certainly done himself no harm in going to McLaren, he's proved to the doubters that it wasn't all the car in 2009. However he's also shown although he's a very good driver he's not quite 'top drawer' (IMO), as usually all things being equal it results in Hamilton coming out on top.
Still a very interesting battle between the team-mates it was...