I might just scrap the 61p Summon itself and make up a list of things I'd want to do with controlled shadows. Since they are incorporeal, it actually makes more sense to build them as Effects, IMO, or at least be more logical than doing the same with ninjas or robots. Also, I can have an arbitrarily high/infinite number of shadows and not worry about running out of them.
Shadow Swarm - Selective Burst Area Damaging Move Object
Reconnaissance - Remote Sensing
Obscuring Shadow Mob - Obscure or Environment
Shadow Face Wrap - Affliction
Shadowbeast - Summon PL10 Creature as per Imaginary Friend
I could probably put these all in a Dynamic Array with a 50p pool and be happy.