Originally Posted by 
optimus2861                     
                 
                 This should be the end of time travel shenanigans on the show until / unless they get new writing staff that can handle it.
		 
		
	 
hmm, i would agree. I wanted them to keep time travel out inseason 2.   since they were exploring the muli-verse    with other alternate  realities . it would confuse people to degree if rush explanations with  bot event's happening.  
 but the writers really wanted it in some how. 
Again it's the writers chose  and they have to see what the audience  see.  Which is becoming a rare thing these days  that some things aren't  connecting with the  audience  if it's not explained well..   it's the  weird cathy movie(the Millisa McCarthy starred in and was written by her  and her husband)  effect again , where the writers think they cleaver  and when it reach's the audience .... thing's didn't go as they  expected.  
the time ramanent's  were explained   finally in the flash wikia 
here it is in this link>>:
http://arrow.wikia.com/wiki/Time_remnant
  ^^ but for some of those of us fans  who don't have access to that or  know of this and just have sort understanding of it , they won't get it ,  if they have short attention span  with how show goes about it or  didn't tape the show.
this  is  why I kept saying they are an echo.  they are a recording  (a  sentient one)  in the speed force and this is why they don't  effect any  past events  when brought to the present  to help hero or villain .  like when that one version of Barry  that died  stopping zoom's final  plan,  before  zoom him self was taken  away by the time wrath's .   
a more Extensive & very detailed "overview" is in the link above 
It's not a past version of Barry ,  it's just a artificial recorded  version of him via the speed force.   The mu has this same thing via the  astral plane with telepaths.