Eddie is alerting to scent so it doesn't have to be that chair, table, sideboard but it was something that was also present at the crime scene on 3 May 2007 that was hidden by MG i.e. CC.
This one does not fly for me.
It is known where CC was on 3 May (strictly the early hours of 4 May) when the first PJ team took photos. It was on M's bed in the children's room. Why did Eddie not alert in the bedroom?
I do not know if CC went to the Payne's at 5H. So the fact that Eddie did not alert in 5H tells me nothing about CC.
Unless there was some pretty weird shenanigans, CC went to 4G for 2 months. Eddie did not alert in 4G.
From this pattern, I would only accept that CC was not contaminated during this period.
Therefore in 27 RdF, I am faced with options in understanding Eddie.
1. Contamination, whether direct or by transfer, occurred after the move into 27 RdF. Since 4G was clean, the only interpretation I can put on it is M's body was moved by the McCanns after the transfer to 27 RdF. Folks, don't flame me on this. I am not stating this happened, merely that this is a requirement of a 'valid' alert.
2. The alert to CC in 27 RdF is false in some way. Note I am not discussing all of the alerts re items from 27 RdF, just CC. From the action of Mr Grime, it seems he was concerned this option might be taken as correct. Therefore, after Eddie's first alert to CC, when he appeared to start playing with the toy, Mr Grime moved it into a cupboard for a second check. Mr Grime asserts that Eddie does not alert in situations where there is no 'cadaver' scent present. If that is 100% accurate, I cannot see that a second check is needed. If it is not accurate, and a second check IS needed, I cannot see that Mr Grime's cupboard check tells me anything. I don't know what Eddie was alerting to. Was it 'cadaver' scent? Or was it just that Eddie could smell where his toy was hidden and was, essentially, repeating his first mistake?
Considering the probability of the options, I don't think Eddie tells me much about CC re 27RdF.
While the lack of alerts in the children's bedroom and in 4G, if any weight can be given to them, imply a body retrieval/body disposal scenario while in 27 RdF, a tough challenge.