@GilgameshDespair
Ah okay, those are better quotes. I didn't mean to argue that humanity wasn't selected (the aliens are on earth, abducting humans, after all) but just that that previous quote about "preparing" and "uplift" wasn't referring to humanity.
And actually, as a compromise, they do seem fascinated by the volunteer. Maybe their *original* plan was just to conquer and experiment as I've been saying. Again, based on what they do in XCOM 2 (or in XCOM 1 if you aren't skilled). *But* then they saw the volunteer use the Gollop chamber, and decided to skip a bunch of effort by negotiating.
... And were just absurdly stupid enough to allow the Volunteer on the temple ship and expect that to work out for them. Or maybe they expected to be able to mind control the volunteer, who knows. There's probably some hubris involved, even though at that point XCOM controls the skies and the battlefields effortlessly.
I just don't accept that they were training XCOM from the start, and I've explained why. Some villain appearing and saying "It was all our plan, now join us!" just doesn't convince me otherwise, particularly when said villain got gunned down without hesitation. It's either an incredibly dumb plan, or a bluff. And since they apparently win if they're able, I say it's a bluff.
They had their own uberpowerful human psi slaves! They didn't need XCOM for anything.