You write: "There is one segment that is impassible from the ridge and requires a short descent down and around pinnacles on the Thunder Bowl side."
Do you mean the last, steep pinnacle before South Thunder? If so, it's 4th or low 5th, but you don't have to drop off the ridge: go around north for a bit, then cross south and pop up through a hole. From there, a downward hand-traverse along a flake with good hands and mediocre feet gets you to easier ground on the south side. The hand-traverse is the crux, and may be tricker going N-to-S than S-to-N.