David, the 85 doesn't need decanting, but as with all Heredia it will change substantially in the glass. With RLdH, the wines can either be open from the git-go, or have a muskiness that blows off after a time. I usually crack and assess based on that.
Sorry there isn't a clear answer, these wines are different every time.
The Tondonia GRs that I've had seem to need a little more time to come around than a comparably aged Bosconia. It's still a baby and decanting might help a little. Either way, enjoy!