ZkinandBonez said:

Kyle's lightsaber was always blue. Except for in Dark Forces II, but that wasn't his lightsaber. That belonged to Qu Rahn.

And then he got hold of Yun's lightsaber, which was yellow.

Probably the only reason they later decided to saddle him with a blue saber was to conform to the shitty RGB colour scheme from the prequels. They did that to virtually all the EU Jedi directly before and after AOTC came out, regardless of whether those characters appeared in the PT -- or the PT era -- at all.