My thoughts are:
- Morrigan has something to do with the Inquisitor having the ability to close the fade tear.
- The Inquisitor is possessI by a spirit, similar to Anders (remember the scene in DA2 Tranquility quest). Maybe the spirits are finally making their move, because they are sick of seeing demons trying to get a foothold within the mortal realm...i don't know.
I thought time moves faster inside the fade, no?
No, the antagonist is responsible for the mark on the inquisitor, Morrigan is not the antagonist.
Maybe but that may be very unlikely.
No, nor does time flow differently in the eluvian realm.
The ogb is completely optional, grows at a normal rate, gender locked, either elf bloodied, a dwarf human hybrid that's taller than a dwarf but shorter than a human or just a human whose only 10-13, theinquisitor is confirmed to be a new character in between the ages 21-39 which means he/ she existed long before the birth of the ogb and they have their own back stories. Also Morrigan can either have a normal male child or she doesn't have one at all.
It's impossible, for the inquisitor to be the ogb, just like it was impossible for Hawke to be the ogb, wish people would drop this theory.