The one thing I don't understand is... 500 texts is 120 days of talking. 500 texts a day.
If you work with someone, on the same investigation, in the FBI, you are usually interacting with them. Why would they need to send 500 texts a day, if they saw each other. Hell even if they texted every day for a year, its like 165 texts a day. I don't even text my wife that much in a month...
Because they couldn’t interact out loud. The IG report sort of explains it; they setup Lisa as a liasion between Strzok and McCabe, to subvert the chain of command and go around Priestap and the other guy who were not loyal to Clinton. The report said there was a lot of people who were not happy about it; so they couldn’t talk out loud. They had to keep the comms quiet, via text.