Don't know where you work so i am going to use random numbers. But this is my basic math.
Assume you work for a company with 1000 pilots. And assume they furlough 20% and assume you are 40% seniority and assume you have 10% senior people ahead of you who are FO's and assume 10% senior CA to you choose to downgrade so that they can have a better quality of life. And assume 50/50 CA to FO after furlough. All these numbers are selected to make math easy... But in whatever number you want...

Before furlough you would be #400 of 1000 pilots (40%)
After furlough you would be #400 of 800 pilots (50%)
So just by this you would be the plug as a CA.
But since there we 100 pilots senior to you who were FO's you would actually be #300 of the pilot group.
But then you had another 50 CA who were senior to you that elected to downgrade since they would have a much better QOL. So you would be #250 of 400 CA.