Quite a few things corroborate actually. He confirms Kate and that all three children were in the apartment alone at that time, which I would say was the most important detail.
No important details corroborate so why should I believe anything is the truth?
1st Witness - Outside
2nd Witness - Definitely Inside
1st Witness - 30 seconds
2nd Witness - 3-5 minutes
1st Witness - Wearing a towel
2nd Witness - Can't remember what she was wearing.
1st Witness - Arrived to take kids out
2nd Witness - To do a check on Kate & the kids
1485 "Okay, and it was at what point that Gerry said to you go and, would you mind checking at Kate''
Reply "Well I mean coming back from the beach I'd got no equipment to play tennis you know, etcetera, so I had to go back to my room to you know change into stuff appropriate for playing tennis in, and err so he knew that I'd walk up that by and past so he said oh why don't you err, you know can you just pop in on the way, the way up, so it was on the way back from me picking the stuff up.'
1485 "Right, so you've walked past, you've walked past Gerry's apartment to get to yours.'
Reply "Mm.'
1485 "Got changed''
Reply "No, you know it was, again whether it was, in my mind it was on the way up that I'd popped in to Kate but it could have been on the way back, again, I'm sorry.'
1485 "No, it's okay.'
Reply "For my vagueness.'
What a muddle

p.s. David Payne was wearing shorts on CCTV. So what did he wear to play tennis?