Hi,
I can break into West Mariner’s keep by using a ladder and platue that is created due an Outbreak.
Video:
I was also afraid it would bork Gordon’s quest but luckily it didn’t.
What happens if you clear the Outbreak?
Gordon returns to his spot, and you will see him from the left tower where you kick down the ladder.
The animation when he calls “kick down the ladder!” will still play (even though I already let it down) so that probably should be corrected, other than that no issues fortunately.
Silas