As I said, Osafune Kiyomitsu(長船清光),Kashuu Kiyomitsu(加州清光)and Harimadaijou Fujiwara Kiyomitsu(播磨大掾藤原清光), they have the same name Kiyomitsu , but they are not gimei.
Since this smith, Mino no Kami Kanesada(美濃守兼定), has a different title with anyone in the famous Kanesada family line, the most likely explanation is that he is another person not related to this family. If he didn't claim he is one of the famous Kanesada, you can't call it gimei.
Also, Mino (美濃) , Nōshū (濃州) or Noshu-ju(美濃住) means xxx of Mino/Noshu, and Noshu seki-ju(濃州関住)means xxxof seki, Noshu, these words are not title!
But Mino no Kami(美濃守) is totally different, it means the Governor of Mino, which is an honorary title granted by Daimyo, Shogun or Imperial court. As Piers said, these honorary titles already lost their meaning.