TinLizzy - Why did JT ROB RMO FP GM KM contradict each other?

If the T7 were not involved and Madeleine didn't die until after 5.30 then why did JT ROB RMO FP GM KM contradict each other?....Why did Jane claim she was down at the beach with ROB and they saw Madeleine and Ella at sailing (and only took a picture of Ella) about 10.45am (approx) Thursday?Mini Sai