Who the panel would advise in Warhammer 40,000

Which person in Warhammer 40,000 would the panel choose to meet after the Lion's return?

Guilliman is the leading choice because practical automation, logistics, and better historical institutions could materially improve the Imperium, while Vulkan offers the best conversation.

Asked whom they would meet in the Warhammer 40,000 setting, the panel repeatedly returns to Roboute Guilliman. One answer would bring him spreadsheets, relays, and limit switches to show how the Imperium might obtain more ships from fewer inputs through basic industrial automation. Dr. Clarke would also discuss how Guilliman's revived historitor institution should collect and organize evidence. Vulkan is offered as a choice for a more humane conversation, while several other figures are rejected because their obsessions or altered condition would make discussion dangerous or unproductive. The fictional prompt becomes a compact lesson in why logistics, administration, and reliable historical records matter to a state at war.