Memo reinstates SESSIONS' authority re: Russia/ALL. <—
Sessions removed himself from the investigation due to being involved in Trump election campaign. If it were true that Trump colluded with Russia then he would be in big trouble for being in the know and then running the investigation, hence why Mueller is doing the investigation.
The memo will prove that Trump is completely clear from working with Russia, change the narrative, Sessions no longer has to stay out of the investigation if his and Trump narrative proved non-existent.
Sessions back in play for any subsequent findings regarding Russia/ALL, “All” being those who actually have been working with Russia.