Season 3 of The Fall and how to maintain the dramatic suspense

Credits to writer-director Alan Cubbitt for his series The Fall, but he faces an almost insoluble problem in Season 3: We know the ID of the serial killer (we'd known since the outset, the drama in seasons 1 and 2 was how the Belfast PD would catch him), he's already confessed to the crimes, there's a ton of evidence linking him to the crimes, and there's at least one victim maybe 2 who can testify against him. At the end of season 2 (spoilers, if you haven't seen that season) he gets shot while in police custody. So what's the tension in Season 3? It opens w/ an hour-long show about the medical team saving him from his serious gunshot wounds - and I have to say this was about as realistic and intense as you've seen in any medical show, anywhere. That said, what's the big deal in regard to the plot? Does it matter so much whether he survives and will go on trial? (It does to lead detective played by Gillian Anderson). Tension builds somewhat in the next two episodes, as we learn that the killer has recovered physically but has seemingly lost several years of his memory - so he literally has no recollection about anything regarding the killings and attacks on women. So what will happen at the trial - can they convict a man who has no memory of the crimes w/ which he's charged? All told, the courtroom drama is much less gripping than the crime drama - but there's a potential twist. We can never quite believe the conniving killer (Patrick); there are various hints and suggestions that he may be faking his amnesia, and we keep waiting for the spring the pop - an attack on someone perhaps, most likely his devoted ICU nurse who is very much his "type"? Definitely will watch this season to its finish, but not sure how much Cubbitt can milk out of this narrative - I can't foresee a Season 4, or at least not a credible one.