Opinion - TFU II Galen Marek is not a Clone
Just finished playing TFU II and throughout the game, Galen believes he is a clone. However, in my personal opinion he is not. Why? For a few reasons:
Reason 1: It seems to me he is suffering from a type of Jason Bourne affect. A traumatic event happened and Galen lost his memory. That event was when he opened himself to the Force when he 'sacrificed' himself for the Rebellion. Vader took the 'corpse' and sent it to Kamino to manipulate Galen into believing he [Galen] was a clone.
Reason 2: Galen began to slowly regain his memories. If he was a clone, then he would not have any memory of his past life. And, the 'clones' that Vader made were failures. This was a decade after the Clone Wars and cloning technology was not a perfect science. Examples are Luuke Skywalker and Joruus C'boath.
Reason 3: Galen was just simply too powerful to throw away. Why waste over 15+ years of formal training?
Reason 4: He let Vader live. He had the chance twice to kill Vader - once in TFU I and in TFU II. It doesn't add up.
So, that's my humblle opinion. What are yours?