It’s the most reasonable place to integrate, and could be done in a couple of ways — ideally at the lower levels; as the goals are mutual
— Remove duplicates for players by providing something of nominal value that useful
— Remove barriers against summoning additional heroes from various portals
Nominal cost adds friction —
Meat, Iron, some junk from inventory
Receive either a random troop on par with turn in
Receive a troop trainer (new) that’s a similar mechanism to trained heroes
Between the buildings, the heroes, emblems, new troops, advanced items — the amount of ham and time required to get a second troop to 23 or 11(or 2 and 3 stars if desired) is daunting.
It should be hard, but adding new troops to the mix without balancing what’s required to level them is suffocating when what’s required to compete increases.