If destroying the gates changes time from whenn rogue/lucy came from the future wouldn't that yust mean everything so far was pointless.
Gajeel would have to lose shadow dragon mode since he got it true future rogue possesign the current one.
Ultear Would come back to life, but should lose the memory of the sacrifise so it had no meaning.
argh so many time paradoxes. If he didn't came back nowone would have destroyed the gate annyways.
Maybe it doesn't impact time at all and destroying it yust unleases all the magic attracting Acnoligia to it.
defeating rogue free's the dragons from his control so each dragon slayer can ride one whenn Acnologia shows up.