Well, the problem is Parson has no time and few options. Wasting the casting on these weakest kind of uncroaked buys exactly what he needs: time and options. The Tool with his hammer and dwagons will be back (adding another bonus to the defenders). Parson can send more thinkagrams to various warlords and leaders. He can waste one thousand troops on a suicidal destroy the siege mission before the fall apart. He can play Ansom to attack before his new toys decompose.
So all in all not bad. Perhaps in the long run adding several reanimated warlords to his army would be better but that's a luxury he cannot afford.