Skillett you are wrong. It goes off of Career Expectations. It's not as simple as you are making it. Seniority list will not be date of hire. Your current seniority at your current airline pre SLI with your current airplanes is plugged into a computer that factors when your upgrade would happen if there was no SLI. Then it comes back with a seniority number.

I had this same worry. But doesn't matter SLI would be years away, if this even comes to be.