There are two important aspects to Karen Westbrook Scranton's revelation concerning Mrs Reid in her "Living History" interview. Firstly, it corroborates Reid's version of meeting Oswald with a coke in his hand in the second floor office.
No, actually it doesn't. It just corroborates that Reid told the same story. It's not an independent account.
So it would appear we have a corroborated first-hand eye-witness account of Oswald being on the second floor seconds after the shooting which itself confirms, to a certain extent, the second floor lunchroom encounter with Oswald and Baker.
No, not even to any extent. Mrs Reid didn't know first-hand that Oswald came from the lunchroom or that there was an encounter there. And in Westbrook's account, there is no mention of
where Reid was when she saw Oswald or how long after the assassination.