With regard to Urdnot Wrex's political power, the truth of the matter is he had next to none beyond being one of the few krogan leaders actually attempting something approaching reconstruction. The female clans don't answer to him - in fact, it's the other way around. ME3 explicitly establishes that Krogan males, including clan leaders, defer to the females in political matters.
Now, you remember the Clan Nakmor ambassador in ME2? Clan Nakmor's a fairly secretive and small clan, and their ambassador is only present to petition for alliance with Clan Urdnot if Wrex leads Urdnot. Fast-forward to ME:A and visit the krogan colony. The vast majority of named krogan? Are from Clan Nakmor. The krogan colony population? About 60% female.
It doesn't break the lore.
Can't speak for the Quarian issue, though, because I haven't progressed that far through the storyline yet.
Completionism. :P
EDIT: It's also worth noting that the default, non-imported save starts for ME2/3 assume what amounts to incompetence on Shepard's part. No side quests completed, no speech checks passed, meaning it stands to reason that as far as ME:A canon is concerned, Wrex was very much dead when the Arks left for Andromeda. It fits even better, because Clan Nakmor doesn't attempt to ally with Clan Urdnot if Wreav leads it, so it stands to reason that instead of signing on with Wrex to try and rebuild (because he's dead and Wreav is an idiot), Clan Nakmor bails to start over on their own terms in Andromeda.
EDIT 2: You know how the news bulletins in the Nexus make mention of beacons to communicate with the Milky Way going unanswered? Consider the first bit of my previous edit. I'm thinking that a low EMS destroy ending is ME:A's canon, and with 600+ years passing, nobody's going to be responding. In part, because this is a setting that has viable instant very-long-range communication via quantum entanglement. If nobody's answering, and you assume that people would've known to answer, the logical conclusion is that there's nobody around to answer.
> If nobody's answering ...
Doesn't necessarily mean that everybody is dead. Even if Shepard won the war in ME3 and even if EA/ BioWare finally decide to make a good "Destroy" ending canon, there could be valid reasons why nobody is responding. It could e.g. be that the needed infrastructure for communication between the Milky Way and Andromeda simply wasn't rebuilt, because the destruction in ME3 was so extensive... there were simply more pressing matters right after the war. And because it was such a low priority ... it simply got forgotten after a while.
Who knows... we might get another cameo by Liara T'Soni via DLC one day? Being Asari she could still be alive after 630+ years and might remember... 🙂
To OP:
You realise that by the time the Intiative leaves the Milky Way, Urdnot Wrex was just a mercenary aboard the Normandy?? He wasn't "God Emperor" of all the Krogan yet... that stuff only happens way later in ME3 when he unites all the clans under his rule.
And how can you know there were no human embassies with the Quarians?? The Citadel Council and Earth are entirely different entities; so while the Quarians may have been kicked out of the Citadel for creating the Geth, that does not necessarily mean that Earth was not interested in having diplomatic relations with them, separate from whatever the Citadel Council says. Thus, having a human who grew up amongst Quarians as part of a human embassy is entirely possible.
Keelah Se'lai ;-)
They really don't have to make anything or any ending canon at all. They could just as easy ask a couple more questions at the start of any game that requires answers as to your canon, the exact same way they asked the gender of your Shep - before the game even starts.
There hasn't been a need for those questions to be answered, yet as they have very carefully not given any specific details yet. Only that the reapers came and that the crucible was being built which was canon for all.
ADM-Ntek,
I guess it is possible by I rather don't like that possiblity, as do I doubt Bioware being capable of creating something as elaborate.
Darla mentioned that she hadn't touched actual soil for a decade(?) and that she was given her own enviro-suit. Tali do mention that quarians life in bubbles until given their own suits, wouldnb't neccesarrily be the same with humans but... Assuming that Darla joined the quarians as 15 years old or so with her diplomatic parents in as early as 2176, her growth spurt could have ended. The Initiative was started in 2176 and then the Initative launched in 2185, that would make her born during 2160 and 25 during 2185.
I guess there is a small chance but I have to refute that possibilty as it doesn't seem probable and overly complex. Either way, in addition to the two ways I states earlier about how the Darla ''vas Hyperion'' character can be taken, this adds a third option.
