Dale Sams wrote:
So the only way to get Omega marks is to do "team-up" missions? Is that correct?
No. You can gather Omega Marks on Defera solo, just not as fast.
Just be aware that "not quite as fast" is an understatement.
Once you get good at group-based STF missions, you can easily earn close to 300 Omega Marks, 3000 Dilithium and a nice handful of change in under an hour's time. To earn the same amount on Defera would probably take a full week's worth of effort.
Having said that, STFs can be challenging and difficult and at times frustrating to less experienced players. There are players who will shout at you if you don't know what to do. For someone starting to play STFs for the first time, I suggest first playing STFs with your guild or any friends you have. Have them show you what to do, what not to do. Above all else, do not join public (random) STF groups as you usually get a bunch of inexperienced players who won't know what to do, resulting in failure.