Why so long?
I'm not the only one wondering why it's taken so long for serious questions and proper investigation of Cotten's passing. I guess that in the first days there was (a) a body and a death certificate and (b) no suspicion of wrongdoing: so the processes for dealing with the purported death will have been drearily quotidian. One obvious question, mind you: who identified the body, and when and where?
Whether or not the body proves to be his, further questions will presumably focus closely on the aliases he used—both the known ones, associated with the dodgy transactions, and exposing other aliases not yet known. The latter will of course be of profound interest to investigators if the body is not his: a thread to pull on when tracking him and the missing money.
Fascinating story, come what may ...