Moving teeth downward - suggestions please

Hi, I currently have braces and noticed that my two front teeth look slightly different lengths (aka. left tooth a bit longer down than the right tooth). Initially, my orthodontist said he could adjust the bracket on my right tooth HIGHER UP so that the tooth can be pulled downward to match the same length as the left tooth. However, during the next visit, my orthodontist assessed my teeth and this time he said he would not suggest moving the bracket, saying that my "gumline" is on the same horizontal plane and that if I moved my right tooth downward by adjusting the bracket higher, that the gumline on my right front tooth would be lower than the gumline on my left front tooth. He said my right tooth is probably shorter due to me eating on my right side more often (wear-and-tear) and that he could file down my left tooth to make them the same length. He said he thinks its more important for the gumline to be on the same horizontal plane than having the bottom of my two front teeth be on the same horizontal plane. I just wanted to ask if this was true - that the gumline also moves down if I move my right tooth downward?