thats because in order to get the Renault engine Flavio did another one of his clever deals in offering Red Bull a cheaper engine if they would consider MArk Webber as well and deal with Dieter not Horner.
Correct me if I'm wrong but Flavio was the head of the Renault F1 team not the Renault as a company. I severely doubt the decision on who Renault supply their engines too had anything to do with him as I doubt a company as big and with the reputation of Renault would put that sort of power in the hands of someone who was technically a manager of a department of their company. The teams in F1 who use Renault engines reflect on Renault the car company and brand as a whole and the decision to supply any team would be a big one for the company so the idea that Flavio can offer Red Bull some sort of buy one get one free deal so he can push Mark Webber is a bit silly isn't it?
Nice conspiracy though.
I've heard Bruno Senna is only at Williams because Eric Boullier said unless they took him on that he'd remove all the nuts and bolts from the Reanult engines he obviously decided they should supply Williams. Apparently Frank Williams is so unhappy at having to have Bruno and the deal being done between Coulghan and Boullier that he's hiring a contract killer to take Bruno out.