Point:  The Masubetsu Kakuto Ryu is a completely unarmed style.
Argument:  Ranma has been shown to use weapons before.  In one of the
early episodes, we see Ranma and Genma fight on top of one of the roofs
with bos.  And very well, too.

Much as I hate to get dragged into one of these arguments...

Ranma's fighting style kinda sorta transcends all other martial arts.
Anything Goes (or Indiscriminate Grappling, depending on who you ask to
translate it) is intended as just that... anything is possible for a true
master of the art. A true master of the school can use any weapons, (I like
Bob Barnes's theory about Ayukawa Madoka learning to use guitar picks as
projectiles from the school) but is also fully capable of working without
them. Take Kuno and incinerate his bokken. His approximate threat level, at
least to Ranma, drops from "mild annoyance" to "don't make me laugh". Take
Ranma, fighting with a staff, and incinerate the staff. If anything, he's
become more effective since he doesn't have the weapon to limit him. If I
ever get around to finishing my response to Superdude's challenge from way
back in March, part of it's going to be a training scene wherein Ranma
proves to Mousse that his particular unarmed style is superior to any
weapon. Of course, if Mousse makes full use of the however many weapons he
has secreted on his person, it might be something approximating an even
match. But I digress...

In short, the bo fighting is a part of the school. In the grand scope of
things, a master of the school is also qualified to master all other schools
as well; he has to be.

--G. Falconar, who wonders how many people are going to correct him on this.