Sauruz wrote...
How do you know your version of Synthesis is different than Saren's? Reaper king tells you so, right.
You don't seem to understand what the Starchild really is.
At the most basic level, the Starchild is simply a means to explain the 3 ending options you have available to you.
Trying to uncover ulterior motives and hidden meanings in his words is about as logical as trying to do that with a simple sign that says "this button is red, this button is green, and this button is blue."
In the end, what Starkid says is what happens. He isn't lying to you; you see it for yourself during the end of the game. Regardless of what atrocities he committed with the Reapers, he is a neutral, all-knowing godlike being, because the story demands that he should be one.
So, if the Starchild says that Synthesis blends together synthetics and organics into a new framework, then that's what happens in the end.
What Saren had in mind was a future with organics implanted with synthetic devices so they could slaves to the Reapers. Not the same by a long shot.