to see nanobots gotten big

[suprunp]

He looked around at the island, as though expecting to see nanobots gotten big.
(Castoff World; Kay Kenyon)

Have I understood it correctly that it means he didn't expect to see nanobots get big out of their own volition, as it were, but rather that something else would get them big?

Thanks.

 

[White Hat]

In my opinion, the nanobots got big on their own (by themselves).

- Which nanobots?
- The ones gotten big.

Although it can be both.

 

[SoothingDave]

He looked around at the island, as though expecting to see nanobots gotten big.
(Castoff World; Kay Kenyon)

Have I understood it correctly that it means he didn't expect to see nanobots get big out of their own volition, as it were, but rather that something else would get them big?

Thanks.

I, too, think it is of their own volition. If I made something "get big," i would likely say that I made them big, not that they had gotten big.