Yes, it keeps coming up, doesn't it? I can only repeat what was discussed in this thread before - and it was discussed, quite a lot, probably more than any other single topic.Str8g8, we seem to be coming up against a wall once again with regards to Shalebridge and Newmarket.
The river the servants are discussing is the big River - if they were talking about the little tributory you actually see in Assassins then why are they so surprised to see it so low and why would NM be horrified ... you could just jump across anyway. It only makes sense in the context of a Big River.
On the other hand, their comments don't dictate Shalebridge is directly bordering New Market, and in fact we have 2 good maps (the keeper map you posted and Garrett's hand-drawn Assassin map) which show New Market and Old Qaurter but make no mention of Shalebridge.
So, it doesn't have to be directly across at all, just across. But it does have to be across the main river.
In my map the relationship between New Market and Shalebridge is still there - if you were a beggar who walked across the River at Shalebridge, then New Market would be the first well-to-do area you would come across, and you wouldn't have far to go either.
Also, I just don't see OQ as unwieldy ... it occupies quite a logical space within the elbow of the river. It seems quite tidy to me, especially, as I say, if we consider Downtowne and Stone Market districts to be part of the Old Quarter (as I've tried to indicate on the map with different font sizes and similar colours...)
As always though the test of any theory is to put it into practice. If you can come up with a better arrangement then post it, and if we can make it fly then it will get assimilated.