What's the evidence that Pena was "generally viewed as a credible witness"? Credible by who? On what basis?
Here is Pena's WC testimony. He says he saw Oswald once with a person who looked Cuban. Neither Shaw or Ferrie, to me, looked Cuban.
Mr. PENA - Well, they asked me in connection with the Mr. Kennedy, the late President Kennedy's assassination, and also if I know anything about it. I told them I didn't know anything about it. They asked me if I saw Oswald;
so I said I saw him once. He went to my place of business with one or two friends. I don't know exactly. My bar is a very long bar, so to me it looked like he was with two friends. My bartender, Evaristo Rodriguez, said he was with only one man, so I don't know exactly. It was something that happened in my place of business; a customer asking for a lemonade; a man. They don't usually do that. That was the first time in 7 years I have been in business that a customer asked for a lemonade. So my bartender he learned to be a bartender at my place of business; he was a seaman before he came to me and said, "The customer wants a lemonade. Do we do that?" I said, "Sure." He didn't know how to make it, so I said, "Take a glass of water, couple of spoons of sugar, some lemon." He say, "How much should I charge ?" I said, "Twenty-five cents." He went .back and made a lemonade and put it to Oswald. Then Oswald got mad. Said 25 cents was too much for the lemonade, and then he asked for a tequila for his friend."
And:
Mr. LIEBELER - Now did you ever see Oswald at any other time?
Mr. PENA - No; I didn't.
Mr. LIEBELER - Did you ever see the man who was with him at any other time?
Mr. PENA - The man that was with him looked Spanish; more Cuban than anything else. You are American. You might know your people. I am Cuban. I can sight them. I don't think I am being mistaken about him, about Cuban people. I can spot them when I see them that they might be a Cuban.
Mr. LIEBELER - You thought this man might be a Cuban?
Mr. PENA - To me, I thought he was a Cuban. I can tell that is true. I wasn't even too close to him.
So which account should we believe?
https://www.jfk-assassination.net/russ/testimony/pena_o.htmAnd here is Rodriguez's testimony. He mentions seeing Oswald once and that Oswald got drunk and sick and had to be helped out of the bar.
https://www.jfk-assassination.net/russ/testimony/rodrigue.htm