If you just measure the girth, it gives an indication as to its growth rate. If you then estimate the log length in it and centre girth, you can have a volume. You can then have a guess as to what you could sell it for depending on the $s/ cubic metre you go with. As you mentioned, the wattle has probably helped it grow, at least in the beginning. Now that it is bigger, it can grow by itself. Yes, the other one near the house is probably going for height and not girth but really it is the girth where the value is.
Yes, thanks, all well here.