In post #8 you gave a Webster definition of Necromancy. That's a limited definition that doesn't cover all the usages of the word.
For one thing it places the emphasis on telling or divining the future. But the Greek word from which "mancy" comes is manteia, which also means "prophesy." And prophesy is both foretelling the future AND forthtelling the present. (See p. 132 of Brewer's online book: re: Biblemancy entry on p. 132): Manteia Greek word for Mancy
And you'll see at this Web site how "mancy" is used for both divination and prophesy: Types of 'Mancy'
The other aspect of Webster's definition is that it always puts the ball in the summoner's court -- that they conjure up a spirit. You'll see in Isaiah 8:19 that another word for "seek" (King James word) is "consult": 19 When men tell you to consult mediums and spiritists, who whisper and mutter, should not a people inquire of their God? Why consult the dead on behalf of the living?
After consultants have taken the initiation to introduce themselves, sometimes those who use them take the initiative. And even then, let's say we could say with certainty that such spirit consultants assumed the initiative 100% of the time, so what?
Review post #27 again, and then ask yourself, what would it matter if these consultants were the 100% initiators? The bottom line would be the same: You've got Mormons consulting the dead for information, for comfort, for counsel, for guidance, etc. -- even if we agreed that these consultants were the iniators. We have hundreds of Mormon incidents where they have consulted the dead -- even if don't use terms like "summon" or "conjure" to describe the dynamics of what occurred.
Responsive consultations -- demons acting as ghosts -- is not exactly any behavior any church trying to associate with the name of Jesus Christ should be actively promoting, which the Mormon church is doing.