This should probably be a separate topic on a different message board, but....
Check my
pictures from the weekend. We descended the chute you are talking about.
Daryl and Mike went up from that col. They described it as mostly class 4, with crux moves around 5.5 or 5.6. On the descent, we all dropped from the Point Powell plateau to the south (see picture 41), then ascended to that col and down the north side (as in your picture).
To climb Point Powell again, I would repeat the NE couloir, although it is very steep (firm grip on ax!) and dangerously loose above the snow. But our descent route down around the back side was no picnic.
Sorry I forgot my camera; I would have taken more pictures.