McArthur had some sort of relationship with each of his victims, some of which were sexual, Toronto Police spokeswoman Meaghan Gray said earlier this month.
Idsinga said police are searching one other property in the city and have two other "properties of interest" in the GTA that they may search in the future.
Alleged serial killer Bruce McArthur has been charged with one additional count of first-degree murder in connection with the death of Skandaraj "Skanda" Navaratnam.
Police have interviewed some of McArthur's past known associates, but Idsinga said evidence unearthed so far indicates he acted alone.
Gay men of South Asian and Middle Eastern descent, with cultural pressures to stay in the closet, were missing long before a white victim's disappearance launched the investigation.
"If he had been reported seven or eight days after he disappeared we wouldn't be here today", Idsinga said.
Navaratnam was last seen on September 5, 2010, in the Church St./Carleton St. area.
Police have only confirmed the identity of one of the victims, Andrew Kinsman.
Kayhan was reported missing in 2012, Marmudi in 2015, Esen and Kinsman in April and June 2017 respectively. The probe was named Project Houston, a police task force looking for him and two other men who went missing between 2010 and 2012: Kayhan and Abdulbasir Faizi, 42.
Authorities in Toronto are seeking the latest charges against a man accused of killing multiple men while working as a landscaper.
Excavation at the Leaside property ended on February 14 and the home was released back to its owners after officers said no other human remains were found.
Toronto police have been criticized by some in the gay community for taking years to solve disappearances dating back to at least 2010. Police believe he was killed between May 2016 and July 2017. "As I've stated before, we'd like to go back there when the weather warms up a little bit and see if the (cadaver) dogs have any more further success", he said.
Ciantar said he has friends who did know McArthur and added, "They all said that they never would have suspected him".
McArthur is scheduled to return to court on February 28.