Margie -- well, that's somewhat the case. It is true that as you bring something in closer, like arms, the entire body will spin faster. But, that's not necessarily why they can respond to changes faster -- the overall small size leads to a lesser area to either spread out positive or negative feedback upon the storm. This can work to lower the pressure rapidly due to very concentrated energy (in simple terms), or to raise it rapidly due to not being able to mix out the negative effects.

99L -- there's some moderate westerly shear across the storm, leaving what circulation is there somewhat exposed. It's a rather small entity and has a shot, but anything that happens isn't going to happen fast.