Complicated thinks Ishmael.
The man who was terrorising the banker was the Toe. He in turn was reporting to the Foot and he had a bunch of thugs under his employe. Now one of them has to report to the Hand which sounds someone more highly positioned.
It starts to seem that simply killing the banker may be simpler than to deal with the entire Jacks organisation.
On the other hand Edistris also had an interest in them so following as many leads as possible would be beneficial either way.
Finally considering what he knows and what his end goal is and since the bank was closed anyway so he cant follow that lead immidiatetly he stays put and observes the house waiting for his target of choice or the man who mentioned the Hand to leave.
Spoiler
Sorry if I am taking it to slow or not doing to much "action" stuff... I am a bit unsure how to proceed to be honest.