That would be fine enough but the question posed was the role of the Particle accelerator, which I can only assume did not exist in the original timeline or Thawne would not have had to manufacture the 'accident' as a substitute for whatever event originally gave Barry his power.
If you accept that the original timeline had Barry gain his power by some random event (hit by lightning, doused in chemicals) and that his foes were the the traditional Rogues, and others like them not created in the new timeline by the Accelerator explosion, then the original Barry Allen/Flash would be something in line with the comicbooks - self confident, self-taught, and a very capable superhero whom the Reverse-Flash fought many times and was unable to overcome. One of the points about Thawne's interference in the timeline has been that his actions damaged Barry's self-confidence and ability to move forward with his life. This is something that has been noted independently by the Harrison Wells of Earth-2. So the influence of Thawne on his old foes revised timeline has been as profound as his impact on his old foe himself. In one sense Thawne did finally score a significant victory then, by killing Nora Allen and altering The Flash's life forever...
So the RF was in the end going back to rewite his own history and Barry as a means to finally being able to defeat him for good?
But wouldn't the Flashpoint evets just be creating alternate timelines for both of them, but keeping intact the original prime one, just as Star trek had their rebooted time line and Universe, but also still had the original one still intact?