Actually, IIRC, there were at least 4-6 others that were canonized with St. Kateri Tekakwitha and St. Marianne Cope. This year, Pope Francis already canonized over a hundred martyrs who were killed by the Ottoman Turks invading Sicily.
Is there are rule about the number of people that may be canonized in one year? A limit on the number of popes that can be canonized?
I don’t think so, because, especially with martyrs, hundreds are often canonized at once - and then listed as St. So-and-so and companions, because we often only remember the names of one or two of a group of martyrs. As for popes, it is rare to see more than one pope being canonized at a time, but that’s because there can be only one pope at a time. We’ve only had about 266-267 popes in total (I can’t remember the exact number), and, I’d say about 1/4 (or more) have been canonized.
Besides Pope St. Pius X (canonized in 1954), we have to go all the way back to 1712 to the canonization of Pope St. Pius V for a pope to be canonized. This is a big deal. We are priveledged to be witnesses to it. This does not happen very often…
Yes, we are very priviledged to be witnesses to two popes being candidates for canonization at the same time. But remember, the most important thing is - are WE living our lives trying to become future saints?