Was Fusion GPS, Steele, and FBI originally targeting Jeb?
Consider -
Paul Singer was the original financier of Fusion GPS
Paul Singer was a supporter of Marco Rubio
Rubio and Jeb were both from Florida
We have evidence of Steele being used by the FBI in early February 2016
Jeb dropped out of the race late February, right before the Florida primary
Why?
Then Rubio loses BIG to Trump in mid March
Rubio drops out
Brennan goes to Russia in mid March
All of a sudden, Fusion GPS, Steele, and FBI turn their attention to Trump
Theory - Rubio's initial focus was to dig up dirt on Jeb to eliminate him from the race prior to the Florida primary.
When he still lost, Fusion and Steele (and FBI) were refocused to Trump, and Hillary picked up the check.