He was Former National Security Advisor of the United States. He must have had access to all classified information during that time. Information on compromised senators would certainly be information someone in his role would need to know and would have been provided to him. Non-sequitur.
Just because he was National Security Advisor does not mean information on compromised senators would be information he would have access to.
There is a huge difference between "should have" and "did have".
It does explain why The Deep State went after him so expeditiously, persistently, and vigorously when Trump was elected. They had to get him out of the position, because he couldn't be trusted by them to "keep a lid on it".
See a file I created: LINK: TIMELINE OF THE GOVERNMENTAL ABUSE OF LT. GENERAL MICHAEL FLYNN
The data is presented in this format, like a spreadsheet, but it is a PDF:
It has many references, quotes, context, active links, and people involved in the Persecution of General Flynn, in a chronological timeline.
There were plenty of people in this country who were all in on this form of weaponized government tyranny, who said "Why did he plead guilty if he wasn't guilty? He's guilty".
None of them have a single clue of what it is like to be the target of a weaponized government that controls the legal system, all the information, and has bottomless pockets.