We could speculate but we don't know...
It look like he was shaking his head at times,
I think he was supporting Berto but I doubt they were planning on fighting him back then...
No... he specifically said, him and 50 were chillin and since they were in the area they wanted to stop by and watch the fight.
& he just happens to be fighting the winner? sounds too convenient. Mayweather's smart and i'm sure he was plotting even then to fight whoever came out on top.