And the Answer is.....

One of the two originally-scheduled tenors, plus four tenors subbing in for the other of the originals. Note: One of the subs is also subbing for a sub (Demuro in for Castronovo on November 24).

Ramon Vargas has withdrawn from the rest of his scheduled appearances in the Met's La Boheme. Francesco Demuro and Michael Fabiano (currently in robust good health in San Francisco) will take the remaining performances not already accounted for, Demuro on December 1 and 5, Fabiano on December 10 and 13.

So let's add this up. Vargas was originally scheduled for November 14, 20, 24, 28, December 1, 5, 10, 13, Jean-Francois Borras for January 15, 19, 24.

• Ramon Vargas: 0
• Bryan Hymel: November 14, 20, 
• Charles Castronovo: November 28
• Francesco Demuro: November 24, December 1, 5
• Michael Fabiano: December 10, 13
• Jean-Francois Borras: January 15, 19, 24, presumptively

I wish Borras the very best of health!