I expect for Maclaren having Nos 1 & 2 on their cars is a major incentive if they give the drive to Jenson. And the Hamilton's made it very clear they did not relish Raikonen joining the team.
It will be interesting to see how Jenson does against Lewis, but the testing ban does seem to be a retrograde step for anyone new joining a team, as we saw during this last season many times over - look at Fizzy - from hero at Force India to zero at Ferrari.
And it does seem a shame the Brawn team name is being discarded so soon but at least they will hold the best success record of any team in the history of F1 for results measured against the number of races entered