This; plus Rosberg was extremely fortunate (and Hamilton unfortunate) with car reliability that season. I think people underestimate the resolve needed to compete with and beat Lewis. Alonso couldn’t do it. It took Rosberg 4 attempts (and some good fortune), and Bottas hasn’t managed it (Yes Button finished higher in 2011, but they weren’t competing for the championship).
It would all depend on the relationship and chemistry/mindset between Lewis and George IMHO, as to who would lose and who would gain from this potential partnership.