Ive watched small bucks rub large trees but only with a EXISTING rub already there. I have never saw a small buck START a rub on a large tree. Mature bucks will rub anything large and small but signpost rubs are usually big.
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That looks almost exactly like the one I saw. I got a glimpse of the 9 pt that made the rub. Took a shot but missed. It will be my mission to get him from here on out!!
I usually look at how high up on the tree it is, that will at least tell me if it is a big bodied deer.
I also like to look for saplings bigger than your thumb that are broke in half or twisted up. A small racked deer just won't have the leverage or enough antler to break a tree that size.