Don't let him put you off Geoff, you're getting SLIGHTLY closer :-)
At least you're having a go!
Well it's pretty easy to see in regards to stones 3 & 6, which would see one stone of your four relocated, but other than a huge messing with the stones i can't see anything else. I have to agree with George stone 2 was a back stone though, i just can't see what else it could have functioned as.