So if Sloan Kelly established a working outpost on Kadara....

Eden Prime was a Prothean colony. It's a video game that follows internal consistency. 

Vaults are there because the writers were lazy. And the game is still a dumpster fire. Well, worse... dumpster fires have better internal consistency.

well if you say so then it must be true! i guess it makes total sense for saren to be chasing prothean beacons so he can access the council chambers when he's literally a spectre and can walk right in

yeah that's the point of the game. everything is going to shit and you have to fix it

i have no qualms about kicking her out. making water freely available benefits everyone. leaving her in charge only benefits her

I usually leave her in charge for the time being, for the leverage.  Over her, possibly the krogan colony, and anyone else who might want to settle there.  It's also a good way to make sure it isn't wasted, doesn't become tainted, or anything else that could happen over a water war.

How different would things have been had a pathfinder traveled with the Nexus?

And here we go again.

Both Citadel and Omega do not face major damages within the series (that would be shown - something as relatively minor as a chunk of a Ward being struck by Reaper debris takes over two to three years to SOMEWHAT put back in order - to the point that large amounts of Tayseri Ward are still without electricity and the repairs are assumed to continue for YEARS). While the Nexus supposedly has similar if not identical capabilities to the two aforementioned stations, you have neglected - intentionally, no doubt, but don't worry, sweetheart, that's what I'm here for - the severe damages sustained. Fourteen months after arrival, only small parts of the Nexus are active.

Radioactive Tuchanka supports only a little bit over two billion, which is a valid number. Too bad it slipped your mind how hard to kill Krogan are, and even they have a hard time to thrive.

Hmm. I have to wonder how much damage did Rayya sustain. I also have to wonder when such damage happened. Nope, it might be falling apart, but it didn't get punched in the face repeatedly, so to speak. Next point.

Mining asteroids would be prohibitively dangerous. Also, all but one Pathfinder ship are lost, many shuttles and other transports were taken either by the Krogan or by the Exiles. We do not even know if there are operational ships capable of such a task. Whoopsie daisy, right.

Technology to establish outposts. What a fancy idea. Too bad that paying attention would tell you the Eos radiation shielding is getting burned out at an alarming rate, to add to other problems. Once again, mentioned in the datapads you likely never read.

You reach beautiful theory on Kadara, but yet again, you fall short with what seems to me like a terrifyingly poor attention span. Isn't it clearly stated that the Exiles are under the radar? They can't possibly trace them to Kadara, and as we know all colony efforts of the Nexus are made on Eos. Kadara is three times the distance in FTL. An easily forgotten fact, I am sure. Oh, did I mention Kadara is actually getting WORSE, as you may find out yourself in the game? They are not self-sufficient. They're on a delayed death sentence, just as Tann intended.

Put two and two together - who would have guessed! There is no "ready-made" planet. Rather a bunch of planets that are dying and unsuitable for long-term colonization. Kadara can barely support the people they have.

I wouldn't pull Aya out, either, as the Scourge shields the system. Should the sensors on the Nexus be in a functional state, they would not be able to detect the planet anyway. Just to add to that, have you bothered to take a look at Aya from orbit, or did you just roll out to pretend you know everything without doing so? Only a small part of the planet surface looks the way the city you visit does. I would be surprised if you never saw the tornadoes of fire and dark skies on the horizon. Right before I'd start doubting your eyesight.

Wait, what? Sovereign didn't know how to control the Citadel?

The Angara were the ones that established Kandara Port, and it was still mostly a wasteland of toxic waters and hostile bandits. Ryder wouldn't have a reason to know about it until he's given the task to fix it and Sloane couldn't be located because no one knew she was there after the uprising.

 Kadara is a corrupt insufficient planet that was likely doomed to fail. That's not what the Initiative wanted. 

I'm sorry for overstraining you too much. I'll do better next time.

Unfortunately, the exact point of an entire main story quest is to track Meridian. Which is lost.

There is one more unfortunate thing here. You deliberately forgetting facts that do not suit your take on the narrative.

ME: A is not critically panned.