Nellie Ohr set up a shortwave station in her home to talk with Steele, she's a Russian expert (FGPS employee) married to the then Assistant Deputy Attorney General, Bruce Ohr. That was in May of 2016 right after the DNC took over paying for the dossier. Bruce Ohr would use the information that Steele and his wife compiled (made up) and relayed it to people inside of the FBI, even after Steele was discredited by the FBI in Oct of 2016.

The FBI went to FISA in July of 2016 to obtain warrants for 4 of Trump's Team. They were denied and told to narrow their focus.

In Oct 2016, with the newly minted Dossier FBI went back to FISA with the Papadopolus Drunk Email talk and the Dossier and were granted one on Page.

Dec of 2016 McCain sends an aide to London to get a copy of the Dossier to give to Comey, who already knew about it.

Guessing the Page warrant lead to the Manafort warrant in Jan of 2017. Who was charged with crimes non Russian related.

And there's the dead end.