Well, sorry...I won't disrupt the flow of discussion by editing my answer, but I've changed my mind. You (or someone) have already commented in the biography that he was called both Junior and Senior. From that, and given the period, I'm guessing that Junior really was not a nickname, and I'd remove it as one. I'd consider also removing the Sr. as a suffix, because that seems incomplete, and simply rely on the explanation in the narrative.