Maybe, but he was highly critical of both drivers and he never acknowledged the way that the car was clearly lacking in development. Just look at the way Renault went from being competitive enough to score points in Italy, to running behind the Caterhams in Singapore, and then scoring points again in Japan - and all of it within the space of a month. Something was obviously very wrong with the R31 for it to be bouncing around that much, but Lopez never acknowledged it. So if Senna was happy to be 14th on the grid, I'd wager it was because he felt 14th was the best the car could do. It certainly dovetails with Petrov's comments that by the end of the season, even picking up a single point required a phenomenal effort from the team.
I'm not saying that there weren't problems with the drivers, but looking at Renault's performances over the last few races of the season, you can't pin all the problems on them the way Lopez has.