Of all the varieties that I'm growing this season, Piloto Cubano exhibits the greatest variation in height, leaf shape, leaf size and maturation date. It all looks like Piloto Cubano, but I have no doubt that the strain for the source seed was not fully stabilized (or may have been open-pollinated within range of other varieties). [In terms of genetics, open-pollinated tobacco exposed to other varieties still manages to self-pollinate to about 90%, so drifting from the appearance of the pure strain happens at a snail's pace, and requires 5 or more years to be clearly problematic.]
I bagged the first tall one to blossom, then also bagged the one with the largest leaves. I would say that about 1/4 of the 16 plants have not yet started to bud. I think that waiting for one of the late plants (to bag) will increase the difficulty in getting maturity and budding in subsequent generations. What I will probably do is propagate the Piloto Cubano with the large leaves, and save but not germinate the seed from the tall one. I would discourage saving seed from the really late ones. I should eventually end up with a stable, large-leaf Piloto Cubano that buds in a reasonable time.
Bob