If you think about it, right after John and Cassius fight we meet Lawrence Fishburne's character who John also happened to let live so we might definitely see Cassius. Basically showing that John leaving Cassius alive isn't the first time where he's left an opponent alive out of respect (He did also do this in the first movie right before he entered the club). However, I don't think the deaf lady is alive, if I remember right John stabbed her basically the same place where he stabbed Cassius, but this time he took the knife out whereas he left it in Cassius. The "Be seeing you" phrase was also said by John to Viggo and Viggo back to John at the end of the first movie and that time Viggo did die. It seems to be something they say when both parties know that they are going to have to kill each other (almost as a formality) or it can also be interpreted as "seeing you in the next life or hell."
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