Wellinformedyid, you are 100% correct. However there is a concept of focusing on one person. Case in point: I know of groups dedicated to getting 40 women to have a name (or married couple) in mind when taking challah. They also circulate names to daven for when kneading, or any other time possible.
So it is perfectly legitimate to dedicate this learning specifically for Gilad ben Aviva, among all those others imprisoned, and leave it at that.