Board Thread:The Flash discussions/@comment-13895380-20170103171048/@comment-24152851-20170104005708

AlphaOfAlphas wrote:

But Barry would know about the changes, especially one so significant. If Eobard didn't lose his speed and didn't have to pretend to be Harrison Wells, he'd have no reason to accelerate the production of the Particle Accelerator and thus, a whole heap of changes would occur for Barry to notice. Heck, Barry might not have gotten struck by lightning that day and he wouldn't have met Caitlyn and Cisco. Even further, he might have gotten his powers later. There'd be no reason for Eddy to die. The portal to E2 wouldn't have happened. I think a whole season worth of changes and more would definitely be worth noting by Barry and he'd definitely notice it. All the changes Flashpoint made as stated in the show are minimal in comparison to this theory.

The only theory I could think of is similar to how younger Reverse Flash appeared in S2, via a time loop. He was like a remnant protected by the speed force, so that event had to happen even though he was technically erased from time. I feel like the speed force protects Legends' Reverse Flash's existence.

It'd be pretty cool if Reverse Flash wants the Spear of Destiny to change his, as he's racing against the erasing of his existence done in S1, but he can only do it for so long. :P But the leading theory is that he wants to use the Spear of Destiny to erase Barry from time without erasing himself -- his own identity. All that stuff still happened, but Eobard could have taken a detour first in an attempt to change his fate. When all this has wrapoed up, the Legends will either find a way to correct the mess the Legion made or wreck time further.

Though being a younger Eobard is also a valid explanation.