It's also very simple to notice the Warblade ability of the same name, restricted to a list of feats, a list of feats mentioned in the Aptitude description. Aptitude weapons working is wishful thinking and trying to force RAW through a DM's throat. It's obviously not the designers intent for it to work that way and even RAW it is debatable (like Curmudgeon did). An unelegant RAW abuse, just like bucket healing.