[quote=@alexfangtalon]
[@Aeternum] My knowledge on an Empath comes from the show Heroes. They can do all the things you mentioned, but they could also mimic the emotions and feelings someone has when using their powers and therefore mimic the powers as well.
[/quote]

I think Sylar had Intuitive aptitude. Which allowed him to analyze complex systems. With that, he was able to analyze evolved humans abilities and copy them which is why he cut their heads open and analyze their brain to find the trigger of their power and somehow copy the ability they have.