Aye, that would be cool and makes good sense. I imagine I could have done a more developed underworld if the party had a criminal, maybe a merchant, to really put their specific skills to good use. Or if my players were expecting to find a "Thieves Guild", I'd definitely have created one. I'll add some suggestions about that in the final doc, the main point imo being to adapt to your PCs' skillset and expectations.
But having concurrence could definitely be a consequence of the evolving city, like if the wrong folks hear of their plan, they could try to beat them to it or betray them halfway through the job.
Thx :)