The
Speed Force contained an
Eobard Thawne from before killing
Norah Allen, or even knowing Barry's secret.
Dude, I think your other comment about not thinking too much about the way time travel has been used in this show is the right way to go.
the harder you think about it the more mess you will find.
Writers try to make as much sense out of it as possible as they progress, but when it comes to time travel Wally West said the best possible thing to say about it (and Kyle Reese in Terminator Genisys said the very same thing): "Time travel gives me a headache"
Let's be honest here, the explanations don't make sense - because when Eddie killed himself it's not that Eobard didn't exist anymore, it's that he NEVER existed ab initio, which pretty much meant that everything that happened in season 1, didn't happen !
This was a good try....
All speedsters that have ruptured the temporal barrier are immune to time paradoxes because at some point or other they have traveled through the speed force.
Basically, if you ever go through that 'time tunnel' that Barry runs through when he time travels you can not be erased from the timeline
except of course that's exactly what happens to Thawne when Eddie kills himself.
Anyway, I think it's okay to admit that the writers have made a mess - I mean, it's a show about a guy who can supposedly move as fast as light, which is ridiculous on the face of it. But if we can let that go, well the time travel stuff we just have to shrug off.
It's a bit disappointing, because I think that there are plenty of ways the writers, with a little more thought, could have made time travel not only work consistently and in a way that makes sense (currently it seems to work whatever way suits the plot).
I mean, the first time Barry travels back in time, there's no past Barry. Yet when he travels back to save his mom, he's also there fighting RF ?
Really, the writers should watch some Dr Who, as those writers manage to do time travel in a reasonably consistent way.
Just shrugging and enjoying the show otherwise is the only way I can see forward. I'm looking forward to Flash starting up again down here, and I'll just grit my teeth and ignore the time travel stuff and enjoy the stuff that I usually do - especially Cisco's silliness.