just some guy said:The Femur will be stronger after the op - the plate and the screws and the bone natural healing.
As I said before the muscle lose is the problem
Unfortunately, I know this through experience (I broke my left femur badly). By the time I was able to put weight on my leg, the muscle had pretty much wasted away. I am left footed and my left leg was always stronger than my right leg. It took a long time for me to build the muscle back up. One possible advantage is that my right leg has become stronger to compensate, and now I have a better balance of power. More good news: I'm cycling as much if not more than I ever did (although I'm a middle aged low powered diesel tourer).
One break is not the same as the other, although 6 months of rehab seems comparable to my case. But, as a younger professional athlete, I'm sure that Gesink's powers of recuperation will be better than mine. Whatever leg he broke, it will certainly affect his balance of power. I wish him a successful recovery.