Same difference.
Similiar to what Vendetta said to what you posted. Sure. But not by Hackett. I was only pointing out that Hackett never said what you posted. That's why I asked if Hackett said what you posted.
I don't see much point to moving Citadel if they can simply defend it with a planet occupation sized task force.
Bioware wanted the Citadel above Earth. If they did leave the Citadel where it was and the reapers just guarded the thing, I would guess there would be only one way Shepard could get on the Citadel to open the arms. Have Shepard with all squadmates, even the one's from ME2, go to Ilos to see if there's anyway to use the conduit again to get on the Citadel. If that doesn't work, I have no idea how to get the arms open. Unless someone calls C-Sec or whoever to see if they can try to get the arms opened.
Or why wouldn't they just bullrush the citadel after taking down the Batarians. This all suggests that taking over and guarding Citadel takes considerable military strength. The kind that even Reapers need to think twice before risking.
Had the reapers went straight to the Citadel, the game would be very short. Most of that time would be from the credits. Even if the arms are closed, all they had to do was leave X number of reapers to guard the citadel preventing anyone near the it while the rest of the reapers do the harvest.
And back to my Initial point of blowing up the mass relay. I don't think Reapers could escape the blast, without pre-existing knowledge of explosion. I'll explain why, it's a little out there, but given how much speculation takes place ITT on both sides of argument, it's no more whacky than the next theory. When you overuse your locater in Reaper infested system and they start chasing you, you'll notice that they eventually catch up to you. No matter how much you maneuver. This means that their top speed is higher than Normandy's. However in the acceleration Normandy has upper hand. And we all know that even Normandy has a hard time escaping the blast. My point being they wouldn't be able to reach necessary speed to escape fast enough.
Even if what you posted worked, the rest of the reapers have to be dealt with. Most likely if you were successful once, it won't happen again since the reapers will be aware of what you did the first time.