Mh, dunno, the In the Presence of Enemies story was not is hown so outside inspirations are not to be ruled out, but if Petrucci would feel inspired to pay homage / rip off / take suggestions from an already existing source, I think he wouldn't go all the way and copy the names as well... if someone gets inspired by Star Wars to have a story about long lost twins, he doesn't call their characters Luke and Leila.