Indeed, or all three of them to a roughly same degree or he just mixed their memory sets together and planned something entirely on his own. Don't forget that Xemnas, as confirmed by Nomura, has an own mind just like Ansem SoD, Xion or Roxas.
So he would completely be capable of only taking bits and pieces of all the memory mix he got and make his own plans out of it.
Oh, that. Lol, ok. When I start to debate/theorize about the overaching main plot I tend to forget the additional baggage that are the non-involved Disney characters rather fast.
I have a good memory when it comes to such KH-trivial things.
I've actually compared some high-quality images of Xemnas and Ansem SoD with MX, Vanitas, Xigbar, Saix as well as Ansem the Wise. While MX, Vanitas and Xigbar do indeed have golden eyes of the shiny, more yellow type, Saix, Xemnas and Ansem SoD have a darker shade of gold that goes almost into amber (not counting Ansem SoD's final form, where they are indeed orange).
Ansem the Wise however has total orange eyes in "normal" mode while in his DiZ-disguise they are more amber bordering on dark gold.
It may be the lighting in some scenes though, as in the Jump Festa Trailer of DDD Xemnas clearly has Xehanort-golden eyes. Just like Riku's eyes sometimes appear blue due to lighting (his true eye color is blue-green or aquamarine), the same may hold true for Xemnas as well as Saix. Only Ansem SoD I couldn't yet confirm.
Here's the proof, captured it myself from the trailer: