"Does it matter what they want? Depending on the circumstances, I wouldn't have listened."

There's all sorts of shady reasons as to why they could be brought back and, depending on some of the shady reasons, Strange straight up would have ignored them. Whoever brought them back didn't have any control over them, after all.

"Though I'm less willing to believe it's a necromancer. Our bodies must have decayed to practically nothing. It would have taken a great deal of magic to raise all of us, and I don't think that one person could do so by themselves."

Just ignore the fact that it sounds like he's speaking from experience.