You are correct. There are Senate rules that call for voting the ‘wrong’ way so that time is banked to raise motions that can delay or steer the debates off course. The cloture vote was the crucial vote. Once cloture passed, there was nothing else to do except be part of the issue vote so that participation would be allowed.
How much delay can be gained is a question.
Mark Levin just mentioned a Congressional Scandal involving McConnell and Obamacare exemptions. It would be great if Ted Cruz plays hardball and presses McConnell to torpedo the Iran vote. McConnell is a menace, a true abomination to America. The fact that the Left is starting to sing his praises should confirm to Americans the nature of McConnell’s duplicitous character.
Mark Levin also commented that Tom Cotton was the only one to vote no.