So? ?
So that "correction" probably indicates a cover up in order to match anything that shows that Oswald apparently did not haul ass down the staircase as theorized to indicate a lone assassin. SO...Baker was told to scratch it out. That written statement... also probably.. was entered into the records by accident.
And you just admitted it 
Where did I say it was a "cover up"?
Let's see. A massive cover-up, per you, is being conducted and rather than rewrite the Baker statement and have him sign it again, they just enter the inflammatory document into the record. Your explanation is that the incriminating document was preserved "probably by accident."
What I think happened was that one of the FBI men filled out the statement and went to Baker, maybe when Baker was on duty and pressed for time, and got him to review it before signing. The agent was going by some speculative news report (not a "cover-up playbook") that Oswald had the Coke in hand. Roy Truly had a similar handwritten statement that he signed; the statements were simply used to support the WC finding that Oswald was in the second-floor lunchroom alone when encountered by Baker and Truly.
Oswald was casually gulping a soda [doesn't matter Coke or Dr P] when he was confronted by Baker [wherever that was]
Not what Truly and Baker testified to. Where they part of the "cover-up" and kept true to the "story" for their whole lives?
