My understanding is that seniority number is updated 1-2 times a year. Sequence is just how many people are in a particular list. (For example if you look at ca’s in Phl the sequence number tops out about 200 or so cause that’s how many Phl captains we have on the list. So while there are 705 pilots total in sequence the highest seniority number is around 780. If you go through every couple months and track sequence vs seniority you can see where people are leaving. (First six months, year 1, year 2, etc) As for a flow projection my way to do it is sequence and include those on leave, minus those that have flowed or elected not to flow. Be interesting to see when they actually update the seniority numbers.