I like the idea that this points to Mashadar but the source material is not in favor of it. I'm not sure it's even wrong- could be there was more to it when RJ first made out book one- which ends so very differently than any other book.
Point 3 here- I would say this could equally fall down flat by way of such things as- Rand has learned to shield his dreams, Perrin becomes untraceable through his wolf dream, Mat in fact no longer becomes Mat
More important is point 4- Mat is never clear about anything. Especially after the memory gain. He may not have ever of had -and in fact it's likely impossible given Rand's ability to purge at the end- any memories of Darkfriends but it's not at impossible that at some point he was mobilized against the both the shadow and the light. Probably only Rand- or perhaps Nynaeve is more annoyed with the Creator than Mat. I think even that Hawkwing mentions that he had fought Mat before? And I would even say maybe Hawkwing isn't even quintessentially of the 'light'.
Generally it's all quite unknown and honestly I think this died with RJ, but it does again make me wonder further about this connection between Mat's lost eye and Eye of the World