I texted the CA a bit later. Rerouted FO was ecstatic because he was getting home sooner with a bunch more pay. Not sure about the pilot who got the rest of the rotation, but that's also just the nature of bidding reserve.

I've learned one key thing since my time here: the company almost never puts my interests ahead of the interests of the company. Therefore, it is my job to look after my interests first and foremost, because no one else is. When I am at work, or dealing with work (reserve), these are my order of priorities (outside of not crashing/following SOPs/losing my job):

1. My personal physical needs (rest, food, bathroom)
2. Time with my family (making commute flights, not volunteering to help scheduling out by self-acknowedging assignments or showing up before I am notified and required to)
3. The needs of the other pilot I am flying with
4. The needs of the FA's I am working with
5. The needs of commuting pilots or FAs
6. Getting the passengers safely and as close to on time as I am capable of, given needs 1-5 are met
7. The needs of any other frontline employee (rampers, gate agent, etc)
8. The needs of any other Delta employee.

The vast majority of the time, given priority #1 is met, then #2-8 are all accomplished by doing my job safely and effectively. The company, scheduling, the pax, we're all happy to be pulling into the gate on time. I won't say never ever ever, but rare is the time that I will sacrifice a higher priority to meet a lower one.

So yeah, if scheduling has not notified me, and I'm at the gate, I'm going to tell them 2 hours to get there whenever they finally call me. At a minimum to fish to see if they'll pull the rotation and improve my chances of being home more (priority #2). This happened another time, and they stuck with the assignment, so I didn't take the full 2 hours. Ended up showing up around 45 minutes afterward after grabbing a bite to eat and we were back on time by the last flight of the day.