If you had pitched with the same co-founder and same idea and still got funded, you could have given PG a big 'told ya so', but different idea, different co-founder, is really a different sitation. Plus, I'm sure YC doesn't invest in many ideas/people that they wish they could, as they have to make selections on very little details.
Out of curiosity, what stage are you at with the new company? Did you close your round with a working prototype? moderate user traction? existing customers?
Again, congrats on the funding. Best of luck with the new biz.