multiple variations on TC necessitate different sized racks.. and of these variations, different conditions will require potentially more gear. THis is pretty obvious for seasoned cascade climbers but something I grew an appreciation for only just recently..
a couple weekends ago I solo'd the whole route with a buddy (cakewalk); last Friday it was the most heads up lead of my life getting into the 3rd couloir w/a single twin and LIGHt alpine rack. happy I had my nomics. Conditions changed the route completely in just a few days.
my point: a few extra pieces is a wise choice in the cascades cuz you NEVER really know what your gonna get.