User blog comment:Icon1994/New Team Members=New Mentors/@comment-24.212.209.183-20121227023115/@comment-34954086-20121228061036

Ok, let's try a different argument, instead of refuting with what we consider, let's refute with what the creators consider:

Say they do bring in the Legion. Tell me, what was the point of Impulse?
 * He fails at stopping the Reach since that goes to the Legion.
 * He fails at being the guy with knowledge of the future preparing them to stop the invasion. Well, if the Reach goes through he must fail. The Legion must obviously have more knowledge about the future to prepare them and stop the invasion since that's their purpose now.
 * He fails at being the central time traveler, since the Legion have to be successful. Why give further time to a something that fails inevitably?
 * He hasn't even tried to bring Wally into the hero game. And honestly, Wally's disinterested in him for that. He's far more likely to take it up due to someone he Cares about, Tigress.

Why bother bringing in Impulse at all if he can't do anything? If they bring in Legion and they take over these roles which you feel Impulse is inadequate for, Impulse has had as much use to the plot and Team as Greta did last season! He helped a bit to neutralise a bad guy, save a good guy. He gave a little characterisation to a new addition (Zatanna V Jaime) from their interactions. That's it.

But, Greta was a one-shot, not even mentioned again. They could quite easily have done the same with Impulse by sending him back/taking Barry's place. Why is Impulse still here? obviously he's not intended to be a useless character who gets replaced by the more effective Legionairres.