for Pink Panther, your memory about a piece of cake is correct. It was in JW's book:
http://www.websleuths.com/forums/sh...caster-ON-30-Dec-2010-6&p=8789647#post8789647
IIRC, PK did say to the effect that some of his words were embellished by reporters.
Obviously LE is interested in any discrepancies told them by anyone they interview, but I guess that's one of the issues LE would like to clarify. IMO, it's not that the cake itself matters so much, but that there seem to be different versions (piece of cake in hand while punching in the code vs the entire cake left in car). Given the shocking circumstances, I can see possibly not recalling whether it was in hand or in the car, but it is difficult to reconcile having no recollection of whether it was just a piece or the entire cake. Given he drove AK to work that morning, presumably she has helped clarify his recollection of what was placed in the car that morning.
As for the cake having been eaten, that explains why (presumably) it was not found at Audrey's or anywhere. Mind you, if it was the entire cake, would be interesting to know the timeframe in which LE investigated its existence. IOW, if it was only within a few hours or the next day, that's a lotta cake to devour in a short timespan.
As posted earlier, the "he drove home and along with Alex ate the cake" can be interpreted either way. Mind you, I guess one could wonder why interject a reference to the drive home that day if the drive itself has nothing to do with the explanation of the cake having been eaten at home after the fact.
Let's bear in mind that, other than PK, we do not have the benefit of any other known players providing us information in this case. If PK is still reading here, he must be shaking his head at what we discuss in such minute detail.