Eu acho que a explicação oficial é que isso não era uma característica compartilhada por todos os Vorta. A primeira Vorta que eles encontram é incomum em ter essa capacidade. Uma descrição mais completa (incluindo detalhes fora do universo) é dada na memória alpha:
Only one Vorta was demonstrated using telekinesis: Eris. As the DS9 writing staff put more thought into the Vorta following their initial appearance in "The Jem'Hadar", telekinesis was discarded and deemed a misstep that the writing team hoped viewers would forget. (Star Trek: Deep Space Nine Companion, p. 155) Ronald D. Moore stated, "Our internal rationale has been that Eris was given this ability for a specific purpose by the Founders (and maybe several other Vorta along with her) and that it is not a normal part of the Vorta 'recipe' in the Dominion." (AOL chat, 1998)