P.S. Then we tested capturing a tier-3 Griffin Conservatory without a stack of weak units using hydras (on quick, obviously). The optimal option turned out to be taking in singles not gnolls, but 4 flies and 2 upgraded gnolls — then the battle was won without losing any hydras. If you take upgraded gnolls, 1 hydra is lost. If you take unupgraded ones, 2 hydras are lost. We used Bron at level 1.
That's brutal.. And what does speed affect?.. Why not take 6 flies then? And does it matter which stack to place them in?