My take on who the two current FBI agents, the one former (retired) FBI agent, and contractor is
Current: Joseph Pientka and Michael Gaeta
Former: Andrew McCabe
Contractor: Christopher Steele
sauces:
https://www.theepochtimes.com/why-fbi-special-agent-joseph-pientka-is-the-dojs-invisible-man_2776513.html
https://www.theepochtimes.com/mccabes-fbi-tried-to-re-engage-christopher-steele-after-comey-was-fired_2766822.html
https://www.theepochtimes.com/how-a-little-known-fbi-unit-helped-to-disseminate-the-steele-dossier_2638330.html
COULD BE STRZOK INSTEAD OF MCCABE, COULD BE OTHER CURRENT FBI AGENTS, but definitely Steele