When I did Huayna Pichu years ago, I had no idea you could go up the little guy too. I'll just have to go back......
Ya, it was amazing how many people were on the trail up Huchuy Picchu, and there was nobody on the trail to Huchuy!
Complete - even with llamas :-)
The rope that is there now has no knots. Not really needed, but nice for coming down. I imagine it's handy if the slab is wet.
Huchuy Picchu is beyond the gate for access to Huayna Picchu, so you need a Huayna Picchu permit to do it.
We we visited the area with an REI tour - We were told that "first come first serve" permits to climb the peaks are no longer available. Permits must be reserved in advance. Four members of our group got their paperwork in late and could not get permits for Huayna Picchu - they got permits for Cerro Machu Picchu (less popular) instead.