There's an interesting exchange in video 2: around 1:15. Randi says quite directly that there is a possibility that certain psi claims are genuine. Turnbull is surprised and asks why this was the first time Randi had said such a thing. Randi points out that of course its not the first time he's said that and Turnbull just hasn't been listening.
I thought it worth pointing out because I've seen some comments around here suggesting that Randi has maintained that psi is impossible. That truly would be an unskeptical claim. But I don't think that's Randi's position.