This is very interesting! My densiflora grows much faster and has more pitchers than my diatas (which is slower, tends to send out too long a shoot with fewer pitchers). My densiflora started out small from BE and has taken off with a new pitcher twice as fast as N. diatas. Plus all my hybrids with densiflora grows weedier (N. truncata x densiflora, thorelii x densiflora, ventricosa x densiflora, etc.). I wish my diatas would grow faster, I love the pitcher coloration and design! The pitchers do last longer than those of densiflora, but densiflora still grows leaps and bounds in comparison. Maybe because densiflora likes more light?!?
Any way, even though sibuyanensis looks ventri-like, its an awesome plant having larger pitchers in proportion than ventricosa. Imagine a plant not more than 8 inches across with pitchers the size of red delicious apples (and that's a young plant!)
Get them while you can. Its always something. You see them available everywhere, then all of a sudden NOBODY has any!
Good luck!!!!!
Michael