Grojean owes his place at Lotus to the Renault connection and to Total. Now they've gone Mercedes and Petronas his seat can't be so safe. However, his sponsors have no place at McLaren, so I suspect there are more attractive fish to throw in the pan.
Here's one doing the rounds - Alonso and Briatori to buy Lotus with someone else's money. Mercedes engine, probably take Santander money with him (again). World domination awaits and they can switch to Honda 2016 if the engine is any good.
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