Acclimitization is always important. You can either spend more time at Puenta del Inca or get on the trail and just take longer to get to base camp. The extra day gives you time to visit the south face as well which is a good thing. Another night near grass is nice too compaired to what lies ahead for the next 2 weeks. Its not necessary but it usually helps the red blood cells.
"Got tight last night on absinthe and did knife tricks. Great success shooting the knife into the piano. The woodworms are so bad and eat hell out of all furniture that you can always claim the woodworms did it."