it's too tough to tell what it is due to it being disfigured. sometimes bugs will suck on it while the pitcher is developing, and when it opens, it will be all deformed. i actually see this alot, especially early in the season. also, if you just got the plant a couple of months ago, it was likely divided this spring by Dean and it may be a little weak.
personally, i see no reason to rule it out being S. flava at this point, but I'd wait for a pitcher to develop normally before trying to figure out if it's something different. If Dean said it is S. flava, then you can be 99.99% sure that's what it is.