A WAG would be that the First Ascent Party (FAPs) picked the names...
I completely forgot about this photo.
I'm going to stir up a little controversy by pointing out that the photo doesn't match up with the coordinates that you'll get from Peakbagger.com for either Aiguille Junior or S'brutal Tower. They have Aiguille Junior as the not so prominent bump (that's why I missed it a few weeks ago and had to go back up) just to the left of Aiguille du Paquoir and S'brutal Tower as what the Aiguille Junior arrow is pointing at right now.
More than willing to be corrected on this issue (considering the sources of the labeling) and if it is correct, I'll just have to head up and climb that pinnacle that is labeled as S'brutal Tower. (Secor's description of it being easy would probably prove inaccurate though. I couldn't see an easy line up it when I looked at it a few weeks ago.)
Also, if I'm wrong, someone should probably report the error to the Peakbagger.com admins.