What is clear is that You are afraid that Frazier might definitively state he Never saw Oswald near the TSBD steps shortly before, during, or after the JFK Limo passed by. This comes down to Priorities. Priority #1 should be finding The Truth. Unfortunately, Your Priority #1 is avoiding anything or anybody that might discredit your Theory.
Why would I be afraid of what has already happened, Mr Storing?
Mr Frazier has already repeatedly denied seeing Mr Oswald in the entranceway at the time of the shooting. So what? His denials are belied by the visual evidence I have uncovered!

As for your position, it is impressively...
nuanced:
1. Without Mr. Frazier's confirmation, the claim that Mr Oswald was in the entranceway is a non-starter
2. Should Mr. Frazier's confirmation materialize, I will dismiss it as an immediate disqualifier of the claim that Mr Oswald was in the entranceway.
Way to cover all eventualities!
