Sorry but in a wolf pack the Omega is the lowest ranked wolf that is always picked on, the outcast, and acts like a scapegoat of the pack. This wolf is often called the "omega" from the last letter of the Greek alphabet illustrating it's low status.
Um, just to avoid conflict, that's the modern, ALPHA'S ARE THE TOP RANKING parent's OF THE PACK kind thing, when you go into even further depths, the omega is not a scapegoat, but a peacekeeper, but go ahead and believe the common theory.
The Omega wolf, have being observed in various wolf packs, is considered the lowest ranking wolf because it is picked on by the rest of the pack and constantly ostracized by its siblings and individuals. The Omega wolf is treated so low that it is lucky to even get scraps while the pack feasts on a kill, and sometimes doesn't eat at all. It is often contemplated why an omega wolf would choose to stay in such situations but it is by far better to be in a pack then on your own as a lone wolf where the world beyond a pack is far harsher then being lowest in a wolf packs 'ranks'. This type of behavior has been observed in quiet a few wolf packs. Mainly in Yellowstone. So we have quiet a bit of documentation throughout the years to prove this sort of behavior and what it constitutes. I would love to see documentation on Omega's being a "peacekeeper". Would be an interesting read Where are your sources that Omega's are peacekeepers?
When you refer to the "Peacekeeper" that fantastical description befits the "beta" more. Because being second in command, usually tends to be the 'peacekeeper' when things start to get heated. The beta also helps in rearing the young and takes a fondness to all the wolves within the pack. Even the Omega. Thus why they're usually referred to as the peacekeeper. But it isn't a term used to describe a type of wolf or 'rank' in a pack. It's just an observational coin term.
Yes, I am aware of it and I've seen it Wolves in captivity are not always the same as Wolves in the Wild. Living With Wolves with Jim Dutcher is a great book (and movie) that showcases some great wolf behavior.