NOTE: This post is entirely theorycrafting, and intentionally ignores the likelihood of this actually happening. It's just an idea I had while hoping for another physical expansion.
THE PROBLEM: Lieutenants Packs, in their current iteration, are a very tough sell. Shelling out ten dollars (or more) for a single miniature, a handful of tokens and a plot deck is a value statement that doesn't even remotely line up with the value of other expansion options to the game. This issue is exacerbated by the fact that spending the threat (and monsters) required to put your lieutenant figure on the battlefield is often a sub-optimal choice, and one the overlord is not even allowed to make on intermission or finale quests. Instead of being a "choose your own avatar" mechanic, agents tend to be selected by virtue of the cards they are packaged with.
MY PROPOSED SOLUTION: Lieutenants could be grouped (and sold) in thematic sets of three. Future expansions (such as a campaign book expansion like Heirs of Blood) can be built in such a way that the villains of the expansion are not explicitly written into the rules, but are instead filled in with the lieutenant group of the overlords choice. These lieutenant sets would be mechanically separated into a mastermind and two agents, and when setting up a mission the player would be told the number of agents/mastermind allowed on the mission, meaning single agent missions would give the overlord the chance to pick the agent that best fit the mission objectives. Plot decks would be reworked to fit sets of lieutenants rather then single agents.
This improves the value statement by offering a unique twist (and a few more choices) to the overlord during a campaign, and
wouldn't lock the chosen agent(s) out of the most thematically important missions in the game. It also decreases the volume of plot decks, making it easier to create mechanically and thematicaly different decks without becoming to similar to what is already out there. Finally, it encourages players to spend more money on descent by making the lieutenant sets an integral part of the campaign experience, making it a useful business tool for Fantasy Flight. For this to work, one set of lieutenants would have to be part of the expansion adding this system to campaigns.
If you wanted to take it a step further, you could pick a monster type that is always available in the campaign associated with each lieutenant set. Since the monster types weren't balanced with this in mind I'm not sure how well that would or wouldn't work.
Currently, I would separate out the Lieutenants into the following groups:
The Cursed Nobles
Lady Eliza Farrow - Mastermind
Lord Merick Farrow- Agent
Sir Alric Farrow - Agent
The Mercenary Army
Baron Zachareth - Mastermind
Belthir - Agent
Splig - Agent
The Black Realm
Gargan Mirklace - Mastermind
Verminous - Agent
Trystane Oliven - Agent
The Sudanyan Eclipse
Ariad - Mastermind
Serena - Agent
Raythen - Agent
The Unchained Dead
Zarihell - Mastermind
Kyndrithul - Agent
Ardus Ix’Erebus - Agent
This Leaves the following stragglers who I admit I couldn't quite get to fit correctly. I suppose since there are 5 leftovers and 5 groups, you could increase the lieutenants in each set to four, in which case I would set them up as indicated.
Skarn
- The Cursed Nobles
Valyndra
- The Mercenary Army (Mastermind instead of agent? She's could be considered a Gryvorn stand in. Zachareth could be demoted to agent)
Rylan Olliven
- The Black Realm
Queen Ariad
- The Sudanyan Eclipse (Two mastermind set? See below.)
Bol'Goreth
- The Unchained Dead
This would have the added benefit of putting one large lieutenant in each group, although some of the pairings (Ariad/Queen Ariad) Might need some mechanical changes to work. Maybe that upgrade could be part of the plot deck and it would be the one deck with two masterminds?
TLDR: I think it would be really cool to package the lieutenants into sets, both from a mechanics and sales perspective. Future campaigns could make use of these sets, using plug and play lieutenant choices instead of fixed lieutenants tied to missions. This would make lieutenant packs closer to hero and monster sets in value (and off the shelf price), and much more likely to make an impact on the table/campaign.