ShiKage's Infighter Build

So would you suggest this 4th job build or no =\? I was thinking at least level 9 MW before 14x...

I wouldn't. At least not past the Fist/Dragon Strike.
In fourth job, you can't just try to max one skill at a time, your points will have to be all over the place. Not just because of book availability, but because levels are so much harder to gain, you need to find a stopping point of one skill, to work on another, and another, and over again.

ShiKage does seem to prioritize the untransformed Pirate more than the transformed one (which is a good thing, it's smart). But I'd imagine that everyone would want to be in their Transformed state as much as they can, dealing as much damage as possible in that state.
As for the rest of his build, I gave my criticism earlier. :x