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I suppose another machine could be a reaper, but they said that Sovereign was just a scout, only scout, lets to check up every now and then. And also I'm not talking about the conduit, I mean they need the Citadel itself (Remember the Citadel is a mass relay used to transport from there to Dark space) to get to us.

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everyone thought Sovereign was a ship. Therefore, it was probably getting from place to place (Eden Prime) via Mass Relays. If sovereign got everywhere using Mass Relays, couldn't another Reaper just pop in again, the same way Sovereign did?

Also, the Conduit (the Mass Relay in the Citadel) didn't really play any role in Sovereign's attack. It's just what got Shepard there from that Prothean world.

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But he has no reason to worry about them invading our Galaxy, the relay on the citadel is closed for good, they can't get to us! Or have the Reapers done this to other Galaxies as well, so Shepard wants to stop all the reapers?

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Sovereign isn't the only reaper. There's hundreds more. The next few games will be focusing on Shepard going into Dark Space between galaxies to destroy the rest of 'em

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If the only way that the reapers can return is for the Citidel Mass relay to open up, and the Protheans re-programed the keepers to only take the order from the citadel itself, and Sovereign is dead (well, as dead as a living space ship gets) you have nothing to worry about, the relay is shut, and you should be fine, right?

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