I am going to say he is right about 5ft9 in right now. Last year he grew by about 3 inches, which created chaos in just about all aspects of skating from his jumps to his clothes, it seemed like few weeks he was getting new clothes and by worlds he was wearing yet another set of clothing and at world team trophy his original long program costume was clearly alterated so it would fit him. This year his height was basically static through out the season. I would not be shocked he gained a half inch between GPF and worlds and his boot problems could be because he grew out of them and he has had a very time breaking them in . This time his feet starting growing first and the rest of him will follow. If his his final growth spurt follows last years pattern he going hit 6ft at the end of it. Thankfully this final height boost is going to take place at the best time which the off season this year. Though I hope it just happens and then he done, so he can just have body be stable enough to gain that refinement on his skating skills that he he needs to be that complete skater everyone wants him to be.