thats just wrong. Have a look at what actually happens before you strawman... If what you think happens then you'd be right. You are wrong.
Enlighten me, what actually happens? Does the 1lb account for the weight of the shorts or something? If so, that would mean for a title fight, the fighter would have to have a body-only mass of 154lbs instead of 155lbs. Why allow the 1lb at all for non-title fights. Everyone in a given weight class should professionally be forced to make the exact weight instead of being allowed to abuse the system. For example, some fighters are 1lb even after they've taken their shorts off.