I think contradictory may be the wrong term here...as flying crane said, two seemingly "contradictory" methods may both be functional. They don't contradict each other, they just use different ways to accomplish a goal. Look at the root here, all martial arts are at their base intended to create some effect on another body. There are only a certain ways that a body can be manipulated and the vulnerable points are shared. So it makes sense that different arts would find different ways to accomplish those goals of hitting vulnerable points...they all work, just in different ways. By training in other styles, you may learn new ways to augment your own style - but as everyone has said, you have to have a base first.
Troublenug is dead on....you have to be able to communicate in one language before you start on another.
Troublenug is dead on....you have to be able to communicate in one language before you start on another.