The main assumption in recent episodes of Star Trek: Discovery is that
The Control can't go to the future to get Sphere archives.
But, I see two flaws in the plan:
The Control will eventually get to the future by waiting out because it can't age and die. Why didn't they plan to send USS Discovery back in the past?
The Control can build an Angel Suit itself because all details are there in the Section 31 archives (from which Discovery crew build the suit) and it can obtain time crystals by infiltrating Boreth easily.
Season 2 finale showed that Leyland is dead, but Control can still continue to exist. Even if you believe that Control is finished, the question is still valid.
What logic motivated the characters to ignore the plan's flaws I listed?