I don't see that it's a problem! One thing to keep in mind is that the DCs can manifest their own will (or something that approximates what we might expect to see from a being who has "free will"), but they won't necessarily do something like that either! Also, just because it happened once won't mean it will happen again! Once we imagine it's a problem, we give the situation a history and a sense of needing to overcome it. Not so good, because the dream will manifest those kinds of qualities.

You might just try asking one point-blank: where is your free will? That might be neat. Good luck!