I thought he couldn't save her because of the brain tumour - ie he could have saved her from Sylar but she was going to die anyway.
Or should I assume that he couldn't actually have saved her from Sylar?
And yes it would be much easier to go back and find Sylar before he became all super-powered wouldn't it.
Or should I assume that he couldn't actually have saved her from Sylar?

And yes it would be much easier to go back and find Sylar before he became all super-powered wouldn't it.
when he got back to meet Ando.