Now, IW and Miami are another thing. Nadal will supposedly play 3 tournaments in 4 weeks in South America. When Acapulco ends he has like half a week until IW starts, and don't forget IW and Miami are back to back.
It wouldn't surprise me if he took a break and skipped these 2 to prepare for the proper clay season.
It would be silly. He can't lose so many points. Besides, we don't know how he'll perform in those clay tournaments. If he loses earlier in one, then the schedule won't be busy at all. IW & Miami are also special since players have days off between matches. That should help.