These illusions are interdependent, producing the thought "I will". It's like team work. If I think I am some 'one', who 'does' things, an illusion of free will quite naturally ensues, and helps sustain the sense of 'I am', 'I want', 'I do', or as Julius Caesar once said, "veni, vidi, vici" (I came, I saw, I conquered.) So, Buddhist minded folks seeking to 'extinguish self' (Buddha's Third Truth) may benefit from checking out their notions of free will. Putting a small chink here can soften the glare of the co-dependent 'self'.