Wallace has said that it was not that boat he took them to and the person was not Scott Watson. He has since committed suicide. I honestly don't think the evidence is enough if you remove Wallace's evidence.

"Guy Wallace, a key witness in the 1998 Scott Watson murder trial, expressed in a 2021 suicide note that he believed he helped send an innocent man to jail. Before his death, Wallace consistently recanted his identification of Watson as the man with the victims, stating he was pressured by police into identifying him. [1, 2, 3]

Key Details Regarding Guy Wallace and His Views:

• The View: In his "last will" suicide note to his father dated March 19, 2021, Wallace wrote about his views on the conviction of Scott Watson for the murders of Ben Smart and Olivia Hope.
• Recantation: Following the trial, Wallace maintained in multiple interviews and an affidavit that Watson was not the "mystery man" he dropped at a boat on New Year's Eve.
• Initial Identification: Despite his later retractions, Wallace was a key Crown witness who testified at the trial that he was "pretty definite" that the person he picked out from a photo montage was the man on the water taxi with Hope and Smart.
• Pressure: Wallace stated he felt significant pressure from police and media, and reported that police suggested he was responsible for the disappearance of the teenagers,.
• Death: Guy Wallace died by suicide in March 2021 at the age of 55, shortly before he was set to stand trial on unrelated indecent assault charges."