[@Hillan] Right now I'm trying to determine if I need a speedster to replace Speed and if so who'd be the best candidate. Thinking on the timeline of events and the point in history you're using for Flash it wouldn't make sense to bring in Impulse for the YA. The story I'm going with for how they start is very similar to the actual story where instead Iron Lad gets trapped in the time and dimension we are using and gathers allies of anyone he thinks he can use/trust. So, unless Impulse came on his own he wouldn't be around to even be recruited.