Im considering that too but i spoke with persons that know what happened and all tell me that ukyo's plan is the best bet getting my bitcoins back. So waiting some weeks or even months more wont hurt me very much but sueing him bears the risk that nothing comes back because the problem might be backed by the company, so ukyo dont have to pay, or that it takes years until a court decision is made and bitcoins come. If any.
For some reason weexchange as a company seems to be important for that "plan". Whatever it is.