I think the idea of a brazillian IC is really useless. Lets compare what is more effective at taking africa, shall we?
IC in brazil method:
US1: Build factory in brazil, move 2 inf, art, armor to brazil with two transports
US2: In brazil, build 1 transport, 1 arm, 1 inf, land two transports wherver
Note - At this point, if the US is contesting africa, they have two boatloads which is tough to counter.
US3: Drop 1 inf, 1 arm from brazilian transport in africa, move other two transports back to pick up newly built X?
So, at the end of round 3, you have dropped 6 troops in africa. You are limited by brazil to drop 3 a round, limiting the use of your original transports. If you want to drop more, you have to shuffle back to eastern to do so.
Transport method:
US1: Build two transports in eastern, build two arm in eastern (and shuffle inf). Move two transports with 2 inf, art, arm to brazil seas.
US2: Bring two transports from eastern to drop troops in brazil, bring two boatloads from brazil to africa
US3: Have two trans that dropped in africa grab brazilian troops and drop in africa.
So, using the IC method at the end of US3 you have spent 31 IPCs on africa. Using the transport method, you have spent 26 IPCs on africa. Troopwise, the IC method gives you 6 troops dropped in africa, while the transport method (for less IPCs!) gives you 8 troops.
Now, if you wanted to keep supply lines going with the transport method, you’d have to build extra transports in US 2 to shuffle with the trans in brazil. However, with 8 troops already in africa it seems unlikely that you would have to, and you could just wait for another drop in US 5. The key, as ncswitch put it, is that at the end of africa, you have 15 IPCs of waste in brazil. Using transports, you have those same IPCs still usable, and necessary for the US. It’s a no brainer for me…