Skills for an Inferno hero.

How can they not be dispelled? Messengers dispel all positive effects. Adepts can dispel them with their purification, and by removing the enchantment as well. It's just a common spell that can be dispelled.

Messengers, dispel magic, and so on, remove spells of light magic, and this is a summoning spell.

It's the most important, if it's hard to call it the *most* important. For demons, speed is primary.

Speed is important, I agree. But if there was a choice between logistics and, say, attack, then attack would still be in first place. Although, of course, this is a very hypothetical situation.
For me, logistics is in the top three most useful skills for a demon, along with attack and defense.