well it'll certainly keep him fit. Acapulco is a 500 so I can't see him missing that.
How does the ranking work for players that were top 30 so subject to their best of 18 rules but then drop out?
Do his current 0 pointers in the 1000s stay compulsaries (for his 18 countable tournaments) until their drop date or can he swap them for 250 and 500s because his ranking is low?
If he can swap them then I can see the point of going to south america with weaker draws and building up his ranking so that he gets a better draw for the slams (he could be seeded by Roland or Wimby) but if not whats the point bar lots of practice? I get the basic rankings system but i don't get all the technicalities.
I don't think this decision of playing a full southamerican clay season is so much because of rankings : they probably think it's good for his game
As for the rankings, it's not really about the 1000s (if he improves his ranking a little bit, he will get a direct entry there and then he will be compelled to play there anyway ; if not, yes he will be able to count more ATP250s),
but it's true that there's a change about the ATP500 as he's not in the list of top-30 players in the end of the year then he will be able to count more than 2 ATP250 (actually he has 3 of them as he was not in the direct entry-list for Bercy) : especially he should be able to replace his 20 points from Barcelona and 45 points from Tokyo as soon as he gets better results.