Trollz/WMG

The original Troll Dolls created in the 1960's are the precursors of the modern Troll species in the series.

 * It just makes sense. Shows the gem-in-the-bellybutton thing has been going on for ages.
 * A secondary point to this WMG; Troll Hair, probably evolved as a sign that particular troll was an acceptable partner, the more ability it had to stand straight up, the better. Which is why hair seems to be so important to modern trolls. Except for Jasper because that is the way he rolls.

In the future the BFFL will eventually bring magic back to world as it was in the past.

 * Obsidian has already mentioned they are more capable at magic compared to the previous Magic of the Five group. So it is entirely possible the girls are capable of it. Shame we will never find out.

The Trollz broke things again by sealing Simon away for only 1,000 years.

 * Previously, the Ancients had sealed him away for 3,000 years, which was enough time for them to grow wise and train the present-day girls. By reducing the number by 2,000, not only will Simon return earlier than before, but there won't be enough time to train a new group of five.