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He's going to need the help of 65 or so others to do it.
No, not necessarily. Here's your refresher course.
2/3 of Senators present can ratify a treaty.

For example...
@ PROCEEDINGS AND DEBATES OF THE 106th CONGRESS, SECOND SESSION

S10667

The PRESIDING OFFICER. A division has been requested.
Senators in favor of the ratification of this treaty, please raise their hand. (After a pause.) Those opposed will raise their hands.
With two-thirds of the Senators present having voted in the affirmative, the resolution of ratification is agreed to.
Mr. THOMAS. I thank the Presiding Officer, the Senator from West Virginia, and the clerk.
By the way, just for information, these treaties were all approved by the Foreign Relations Committee on October 4 and 5.

2/3 of the Senate wasn't there. Those present voted for the ratification. The quorum call was rescinded with no objection. That's 34 treaties ratified with a hand count!
It doesn't matter if they aren't present when the vote comes up.

So we have the potential of all these "stand up guys" simply not showing up when it comes time to vote and they can then truthfully claim "I was against this treaty".

They need to formalize their intent to object.
Executive Calendar

When a notice of intent to object is given to the appropriate leader, or their designee, and such notice is submitted for inclusion in the Congressional Record and the Senate Executive Calendar, or following the objection to a unanimous consent to proceeding to, and, or disposition of, matters relating to nominations and treaties on their behalf, it shall be placed in the section of the Senate Executive Calendar entitled “Notice of Intent to Object ”. (S. Res. 28, 112th Congress) Don't forget the importance of this either... When a notice of intent to object is given to the appropriate leader, or their designee, and such notice is submitted for inclusion in the Congressional Record and the Senate Executive Calendar...

It could be ratified due to one person simply not doing their job properly.

...he plans to pass the UN Convention on the Rights of Persons with Disabilities before July 26—just 13 days from today. He has scheduled a formal committee vote next Thursday—July 19.
If the vote is taken on the 19th it moves to the Senate that day if passed. There is no lag so I see no reason to have this July 26 mention. Action could come as soon as the 20th or 21st!

Senate Consideration of Treaties September 15, 2009

If the committee votes to report a treaty, it is placed on the Senate’s Executive Calendar and must lie over on this calendar for one day before floor consideration. The Senate may waive this layover requirement by unanimous consent.

They tell the Senate it passed and the Senate acts then or sits on it.

Again, homework done! Note the date!