I think we will be going for "Site picture descending" and that will also be the time we suspend the AVAD / EGPWS. However "intercepting" and "established" are two necessary phases - its no good waiting til on the ideal GP before starting to descend - you will inevitably go too steep. There has to be an element of anticipation (Jim's "intercepting") prior to seeing the ideal picture.
I am sure we had this discussion before (but think I lost that time) - but isn't it "site picture" - ie the picture of the landing site,
rather than "sight picture" which seems tautological to me - what else can you relevantly do with a picture but have sight of it?