The Demonologists will summon troops worth 52-105 for each units.
That means an average of 75% and 7500 leadership for the first cast. Still there is such a huge difference between the units summoned.
Druids will summon troops with a total healt of 20-25 HP pr. unit.
That equals 2000-2500HP for 10.000 leadership of druids summoning
Dryads summons thorns worth 8-10 leadership. pr. unit which equals 40-50% of total leadership. 4000-5000 leadership when cast with an unharmed troop.
1 Royal thorn may summon troops woth 150-300 leadership. On average it's 225 leadership which equals 59%.
10.000 Leadership Royal Thorns will summon 5900 leadership smaller thorns
Hayterants lays an egg with 50% leadership
Choshas summons 80 leadership Gobots. That equals 36,4%. 10.000 leadership means 3636 leadershop Gobots.
Royal Griffins summons 150 leadership Angelic Guards each. That's 50% and 10.000 leadership Griffins will summon 5000 leadership Guards.
Demons summon troops worth 90 leadership each. That equals 30% or 3000 leadership for a full stack. Like the Demonologists its really a matter of luck what you get.
I hope that includes everyone. Note that i wrote HP on the druid summon. That's not a mistake