I understand and have no problems with you posting about your hopes and dreams... but its quite another thing to spread rumors and innuendo about Marcelo (including spreading rumors of a possible defection/betrayal).
The thread on JJ Gear that you're talking about merely consists of some New Yorkers begging Tatiana (Marcelo's wife and a regular poster on the board) to open up a location in NY. This is as far from reliable information as you can get.
I have trained and spoken with Marcelo on several occasions in the recent past... while I am no "insider" regarding information of his future plans, he has always struck me as being a kind and LOYAL person. He speaks with fondness and respect about Alliance BJJ and Jacare Calvacanti (the older one). He has spoken to me about how Jacare looked out for him and his career (including endorsements and sponsorships). Given this fact, as well as the fact that Fabio (Alliance BJJ NYC) only recently hosted a seminar by Marcelo (I believe it was in December or January)... I'm wary of all of the things that you have "heard".
In any event, even if your speculation is true... why would you want to train with an instructor who betrayed his long time friends and mentor (even if he was a world class fighter)? How much loyalty would that instructor have for you (some stranger in America)? Helping you reach your full potential in BJJ would certainly not be a priority for some one like this.