Btw I actually decided to use Dvalen (the iron dwarf) and I found out his passive stacks, if you send him + 2 troops with 1 hp it gives +40% chance. Also for some reason my addon whatever the name but one of the common addons that counts success chance for missions doesn't take his passive into account when suggesting teams. You can often improve the chance if you plan on utilizing his passive. If you get the +1 troop perk (assuming you're done with armaments and don't want to keep sinking resources into 1% chance for follower legendary*) it's fairly easy to save some troops with 1 HP for using with Dvalen.
* - command center is coming up with the legendary follower item perk, at least on EU, I would assume it's the same on US? I would hope it's not just random chance but fairly reliable way to get one before the building is destroyed, as I've NEVER EVER seen a legendary equipment across 7 alts, neither from missions table / reclamation (monk / druid / shaman perk) or work orders.
Also as much as I would love to keep Ymiron for his lore and make him serve me, I sent him to early retirement because his passive perk is super useless. In that case, keeping Dvalen for second Pummel seemed a good pick.
All follower items are unique-equipped meaning if you try to slot the same item twice it won't let you saying "this champion already has this item". But you can stack them among different champions no problem.
Yep, one strategy is to have several champions with the +chance to long missions equipments and then deliberately not counter slowing if the base mission is 8h or less (just to enable the equipment).