I'd call the tiveyi pitcher an intermediate, not an upper; no tendril coil and not quite infundibular like the others I've seen.
If the cutting was of a section making intermediates, it would not have to just make uppers, and I don't see why it might not revert (we don't understand everything about how plant hormones work to control such things after all). But, though x tiveyi uppers that I have seen usually have at least small wings, they are also highly infundibular like the maxima parents and still have rear tendril insertion like most uppers. If it weren't for the fact that your pitcher is hanging in the air and has tendril insertion starting to lean toward the back, I would have just called it a lower; veitchii produces lower-style pitchers for a long time from what I've seen and the trait undoubtedly can carry over.
Amazing plants! To be honest, I'm a bit jealous of all of those beautiful (and tubby) pitchers. My ventrata has been making tons of leaves and is currently forming a few pitchers. It seems determined to claim my desk as it's own, as well as my east window. Lately I have been focusing on my army of baby capensi and spatulata plants. I hope to get some more growing space as well as some more neps this spring. Good luck and great work!
Your tiveyi certainly is big. How long did it take to grow it that tall?
Very nice. I like the pattern of the red speckling under the lid on pretty much all burb hybrids and this one keeps that up.