I dunno what your seeing. But im looking at it right now and its looking pretty green to me. I see markings and messed up tips from the (FUCKING) pests that invaded the poor thing.
I think what your seeing is a freshly LST'd plant, so yeah....the leaves are weird. This thing got rootbound in a matter of 4 days. I think its pretty healthy.
edit: thin....yeah i agree, thats why I hate growing Sativas, but its fine, it will be fun.