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Yet Scarlet Witch is more closely linked to the Avengers so the MCU got her, Quicksilver to the X-Verse so Fox got him.

The swap-deal to have Quicksilver appear in AoU wasn't a permanent one hence...

And it's not actually a thing: http://uproxx.com/gammasquad/marvel-captain-britain-television/3/

Just some over-enthusiastic, unconnected producers trying to submit a pitch.

It's very much blown out of proportion.

The original tweets from the costume designer didn't mention Netflix at all.

If it's genuine (and that's a BIG IF - especially this close to April Fools...