As I understand it, this is a Senatorial procedural rule to allow the subject to be considered again in the future:
“As Sarah Binder, a Senate rules expert at George Washington University, explained, it’s not that the majority leader has to vote no. It’s that somebody on the winning side of the cloture vote — in this case, the side voting against cloture — has to file a “motion to reconsider” if the matter is to be taken up again. “I suppose the broader parliamentary principle here is that it would be somewhat unfair to give someone on the losing side of a question a second bite at the apple,” Binder explains. So the rules provide for senators whose opinion has changed to motion for another vote, whereas those whose opinion stays the same don’t get to keep filing to reconsider.”
If my reading of this is incorrect, maybe someone who has more knowledge of Senate rules and procedure adjust my understanding.
They only needed 60. Ditch could have chosen to be #60.