My character arrived at Kvatch, and just out of curiosity, entered Kvatch without closing the Gate first. To my surprise, he got in, killed some stunted scamps and entered the chapel. Naturally, Martin doesn't want to go back to Weynon Priory.

My questions are:

1. Is this possible in the vanilla game? I have some mods installed, so I'm not sure and I don't want to replay the game without them just to see if it's their doing. Can you really enter and clear Kvatch before closing the gate in vanilla?
2. If so, do the daedra respawn when you enter the city with the Guard after closing the gate, even within the 3-day respawn rule? I don't expect him to need more than two days clearing that Oblivion plane.

My Google-fu failed with this one.