Look back at the drivers Martin has spoken to on the grid this season and then look how many of them had a good race. Its no wonder he struggles to actually get to speak the drivers on his gridwalk.
And don't forget Hamilton last year at Interlagos (or was it China?) when Brundle interviewed him on the grid for the first time ever? 
His grid walks could be better, but he's a great co-commentator. But for me nobody will ever be as good as the late James Hunt when he was alonside Murray.
I am sure he talked to Massa on the grid in Singapore this year and well look where he finished that race.
And I remember he talked to Nico on the grid at Malaysia last year and look what happened to him. I wonder what would happen if he talked to Sutil or Fisichella?
He also spoke to Glock at the German GP (I think) and he ended up having that big crash.
Actually its becoming rather bizarre I am thinking back to over this season and who he has spoken to and where they ended up finishing (if they finished at all for that matter)
See this is a reason to ban Martin Brundle or atleast ban his gridwalk.