Each of the Specializations named for a lightsaber style--excepting Shii-cho Knight--gives us a Technique talent that allows for another Characteristic to be substituted for lightersaber's default of Brawn. They then have a few talent that require this Technique talent to utilize. Soresu Defender is no different so far.
However, Soresu Defender is built a bit differently. With the right-most column of its talent tree, there is a path that allows one to bypass Soresu Technique and still get to the heart of the tree. In fact, there are paths that allow access to the entire tree while skipping Soresu Technique and the two talents that require it (Defensive Circle and Strategic Form). This means that a character with high-Brawn and crap-Intellect can still get a lot out of this tree without "wasting" any XP on talents that are not of immediate use. Of course, if that character eventually raises Intellect, those talents are always available to be picked-up later. This though came to me when a Brawn 5 (and average everything else) character was looking for a lightsaber style. While Shii-Cho would have been the obvious choice, there was a desire for a defense against ranged attacks (Reflect), so another option was explored.