After doing Anayet from the other (classic) side, we did this circular route, starting near Canfranc. It was straightforward to the lakes and col at the base of Anayet and the Vertice de Anayet, but the return was complicated. We lost the "mojones" (cairns) and just had to make for a point in the valley below, but it was not straight down. There were dips and small barrancs and gorges to navigate past. Eventually we came out by the hut we'd passed on the way up and the rest was straight forwards. Don't have a single shot of this day, only of the Anayet day.
Still, superb route if you don't mind bush-whacking a bit and if the weather is fine. (Wouldn't like to do it in poor visibility.)