I think that Macnaghten personally investigated Druitt -- several years after he killed himself -- by interviewing the MP, and then his family. He knew perfectly well that Druitt was not a doctor, and thus did not confirm this semi-fictional profile in his memoirs.
I thus reject the paradigm that only Anderson made such definitive claims about knowing the fiend's true identity, and do so because the certainty of the MP, of the family, of the North Country vicar, and of Macnaghten in 'Aberconway', and in 1913, and in 1914, is a straight through-line.
I am not taking the press accounts as gospel.
I am saying that Macnaghten manipulated the media, with enormous success, via an ecumenical propaganda offensive via a Tory worthy, Major Griffiths, and a Liberal gadfly, George Sims, but the pair were not on in this.
At the time of the late 1890's, into the 1900's, good cops such as Swanson, Littlechild, Divall, Anderson and Abberline began to fall under the self-serving spell of the brief 'autumn of terror' -- the exception was Edmund Reid.
Now I will not be drawn into suggesting who could have been responsible for that if that was the case but a motive could have been for persons or persons unknown to obtain finacial gain in some way or to enhance the Kosminski suspect theory again for financial gain.
Didn't the Behavioral Unit in Quantico have a go and named Kosminski , Aaron Kosminski as a likely suspect for JTR?
Yet again, if evidences are lacking, a different suspect will turn up on the basis of such lacking evidences and information.
At my stab in the dark years ago before i knew of this computerized behavioral Unit at Quantico, find a suspect for JTR, i briefly swayed to Aaron Kosminski too, however i am resolved to thinking that i'll never ever know and am just learning the character plots and human sufferings along the way, just the why's and cause along with effects. I am at present resolved to that one and in much agreement with Philip Hutchinson.