I suppose they could just be going with an ‘exploring trauma’ situation with Detmer (since they ruled out concussion) but it definitely feels like something more is up. Perhaps Control or perhaps something came along for a ride from the wormhole (certainly not our first ‘wormhole aliens’ after all).

Exchanging letters where they addressed each other as “dear dad and husband”/“sweet child and wife”...

I didn't Blaine very sexy in his buttoned up outfits. He wears those right red pants OUT. But he's also been shirtless in a calendar, sweaty and boxing in a tank top, singing in the shower, and hooking up with Kurt in the backseat of a car.