Playing around with the flankers and the capstones points of contact with them i guess it's pretty fair to say (and quite obvious imo) that it's gonna eventually slip off to the SW. Until you look closely you couldn't imagine the minimal contact it has with stone 4, basically the only thing keeping it from going. :O
http://oi50.tinypic.com/241s1mx.jpg
Other thoughts: If the fallen stone was supportive, and given it's height, that'd make it and the closure stone the only supports ?
I'm finding more questions than answers, but i'm not sure if what i'm coming up with is just pure bollocks because i'm looking so hard for something. :/
Btw Roy, do you consider the slope/angle on stone 4 significant ?
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