first off, take into concideration that you need to do what will make you happy and what you will enjoy, you can goto school everyday and take you classes, but if there is no desire to learn, then there is no point, so if you stick with gumdo then your heart has to aswell. but if you think that going to this place that will teach the art you want to learn most, then do it, wether your master teaches gumdo or tai chi, he will have respect for another art one martial artist to another. so go where you feel you will get the most out of. besides, learning two arts can only help you to improve.