The base-specific seniority list seems somewhat accurate. It also correlates well with 3XP. That's why I was using that as my source.

I'm happy to stand corrected if I'm off with my numbers.

That list is a projection into the future.
I.e. it shows who is going to be where when the flow plan it is based upon had a chance to run its course.
For example, on the CRJ side it does not include FOs going into upgrade classes March, April and May, but does show the two pilots that won't be online until early May.
In other words, that particular list shows (sort of) what the things will look like in May 2019.
The confusion, if that's the list you are going by, is understandable. Read the header though.

The month when dera gets a line and has less free time on his hands cannot come soon enough :D

That's not causing any confusion in my end.
I compared it to 3XP and the reserve list, so I know I'm not counting the bottom 21 who are not through training/IOE yet.

Yeah, I can't wait. Thankfully based on current facts, it won't be too long :)
Instead of these snarky remarks, you could perhaps show me where I went wrong with the numbers I posted? And show me who really is the junior lineholder, when you claim it is not who I (and 3XP) said it is.

Oh and - just wait for the day they assign me Standby Reserve. That's when I get REALLY bored.... :D

Also compare the top portion - as stated, you are also not counting the pilots that will go to upgrade training next 2-3 months, but will hold the lines before that happens.
For the smallish CRJ FO group of 60ish that's a difference of 10-12 seniority numbers to hold a line.
Also when checking for the line holder's seniority, go by the actual lines, not relief/composite. Guys don't want them/forget to check the box/whatever, so those sometimes go way junior.

Man, by skipping that valuable experience you are foregoing an incredible opportunity to go explore all the secret nooks, crannies, shortcuts and hidden gems of your airport. Not even going to mention the sweet per diem you could be raking in.

Yeah, the junior guy I mentioned is a hard line holder. Junior cmp guy is soon after him, a late 8/2018 hire.

Again, the actual numbers: BLK 244, a hard line, went to a 8/13/2018 hire. 10 people ahead of him also hold hard lines. So it's not just a random anomaly.

Highest CMP line, BLK 333, went to a 8/27/2018 hire.

If I'm reading 3XP wrong, do let me know. I can sound like an opinionated a**hole here, but I'm also more than happy to admit if I'm wrong.

I can't see your 3XP and I did say that March looks admittedly better than February a bunch of posts back - that's mostly going by N6D