Alright I made this thread because I was just going to let this one slide and wait till other games to point it out but I can't anymore lol
In the Ultimania of Birth By Sleep, one subject addressed was "Xemnas being a nobody of two keyblade wielders, Terra and Master Xehanort (technically speaking), why couldn't he wield a keyblade like Roxas who was a nobody of a keyblade wielder, Sora (& and to a small extent Ven seeing how he could use Ven's keyblade when dualwielding)?
Nomura responded with something that kind of ticked me off a bit but accepted. He may have not been using one intentionally. Here are some theories/hypothesis/speculations I came up with.
1. Apart of Xemnas was keeping him from using the keyblade to try and stop him consciously. What I mean by this is like how Xion was able to toss Riku the keyblade through Roxas. Maybe apart of Xemnas was holding the keyblade back so he couldn't carry out his warped and twisted plans. Whoever this is could vary from Terra to Eraqus to a mixture of the two, I don't know.
2. Here is one that is way to thought out to be true but I'm throwing in there anyway.
Riku was preventing him from using it. Hear me out, when Riku took on the appearance of Xehanort's Heartless he somehow managed to obtain another keyblade and dual wield at that as well. In KH1 correct me if I'm interpreting this wrong but Sora claimed Riku's keyblade as his own in Hollow Bastion and left Soul Eater with Riku from Post HB, through CoM, and beginning of KH2. Riku managed to obtain a keyblade AND another keyblade through the influence of Xehanort's heartless, this keyblade that he took as his own could have been the one Xemnas was intended to use. I mean Roxas and Sora are constantly trading everything with each other; memories, power, the keyblade so why can't Riku do it when he is in possesion of Xemnas' other half? Fanficish I know but I had to throw it on the table.
3. Maybe Nomura just threw that in there to be funny and there is no way Xemnas was capable of wielding a keyblade.
So please discuss.