What are you saying Allan, He left his own "home" planet defenseless (well all he left was puppets), hes not even there to defend it with his main fleet.. Unless hes "invading" Alkard with his fleet, then what hes doing is just stupid. Yuihos planet is now all for the taking. He doesnt rule over a planet anymore lol. Unless he invades a new planet. Surely the military of Alkard arnt going to lay down and let him occupy their planet ? Even if he comes allies with Alkards Crown prince, he still just lost his planet. (we are assuming crown prince killed the emperor too right?) Emperor is out of the picture.
But then you could say, hes playing cat and mouse ? yeah sure, keep moving around in a fleet to avoid Beiyangs fleet, but now you have a loss of resources and income... its not going to get very far. And how long will Alkard tolerate having their airspace blockaded ?