My question still remains. If NO amendments are agreed upon to change the original bill (which has already passed cloture) is only 51 votes then needed to pass an unamended bill?
Each vote in the Senate can be subjected to cloture, and a vote on the bill, even if unamended, is a vote. Every vote. Vote on the amendment, cloture, Vote on the final bill, cloture.
Not exactly. What got past cloture was a motion to take the bill up for consideration. So, the bill is up for consideration, and being voted on. I don;t know of any suggestion to vote on final passage of the underlying bill, but when that suggestion comes up, it is an opportunity for objection, and another cloture vote.