This would actually be kind of cool if it were true (but only ‘kind of’). This theory states that series creators’ Damon Lindeloff and Tim Kring have conspired to create different stories in a connceted “universe”-- that Lost's island is a super-hero generating machine, and each of Heroes’ heroes got their power from the island, like we are seeing happen now with Desmond.
The idea that two shows could interconnect without anyone seeing it coming is pretty interesting. But believing that it is actually happening, especially this far along in both series… well, that is just stupid.
But if it were true, ten-to-one Ben would trick Sylar into cutting off his own head before he knew what he was really doing. Any takers?