At most, B-4 might be able to grow to the point of being a functional child with occasional flashes of Data's memory. And I think that's potentially a hell of a lot more interesting than resurrecting Data.
Interesting note: As I have stated before, I've written a number of short stories, which I had intended to send to Strange New Worlds
. Alas, this was not to be.
Anyway, my final short story (as of now) was a post-Nemesis
tale, focusing on B-4, and the true beginning of his growth. (As I recall, it involves Geordi and Leah Brahms --not to mention Barclay....) Actually, I treated this growth much like Chris is suggesting.
Proof once again of the ol' saying: Great Minds Think Alike.