The Reapers know that a straight fight is risky for them and gives races time to fight back and find their weaknesses. That's the whole point of the Citadel. Destroy the governing power, cut off the relay network and purge each system one at a time with overwhelming force over hundreds of years. Not to mention, there may be good reason why they like the cloak and dagger approach so much, because each fatality may amount to racial genocide to them. When that comes into play, using the Citadel seems even more important.
Now for the events of Mass Effect to occur, we have to assume the Citadel is the only place the Relay network can be shutdown all at once. We know now that there was at least one back door, being the Alpha Relay. Basically things could have easily gone down like this:
Plan A: The usual. Send transmission to activate Citadel Mass Relay and warp the Reaper fleets back for another invasion. Unfortunately the Keepers won't accept the transmission (Protheans messed that up).
*In between here Sovereign could have updated the rest of the Reapers. For all we know they could have started flying back here, possibly hundreds of years before ME1 but also leading to...*
Plan B: Do it manually. Indoctrinate some minions, gather a force to take the Citadel, activate the Relay afrom within. This still gives the Reapers the element of surprise, total relay lockdown and no true threat of Reaper deaths. Again, Prothean obstructionism combined with Shepard's efforts in ME1 foil this plan.
*Sovereign is dead and the Reapers could have noticed and started flying back at this point as well.*
Plan C: Use our oldest/elite minions in the Galaxy (collectors) to prepare for our arrival while eliminating the Human threat. Build a new Reaper out of Humans and use it to either activate the Citadel, cause chaos until we arrive or just get the Humans Reaperfied (their chosen race this time around) so we can concentrate on killing everyone in the Galaxy when the invasion begins. Events of ME2 destroy the Collector threat (maybe depending on choice) and Human Reaper baby #1.
*By this point we know the Reapers are on their way*
Plan D (or part of C): Use the Alpha Relay to get back. Events of Arrival prevent this from happening.
Plan E: Fly back, beeline for earth and gather forces along the way, crush/reaperfy Humans ASAP, kill (reaperfy if possible) shepard, pacify core homeworlds, take the Citadel and return to Plan A.
Modifié par Balek-Vriege, 20 juin 2011 - 12:51 .