Rita_Poon
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That is alluded to by Leto in 2049, the thing is, he had put 'the magic' in Rachel as best he could, what he didn't for-SEE (not an accident) is that she carried similar to Roy in that her code left her compromised, hence the life bubble in the sequel. It's the give and take of the complex, the ghost in the machine, the touch of the divine resplendent in corruption.It’s deliberately ambiguous and is put there as a head wrecker.
Take it one step further.
How did him and Rachel conceive a daughter, if they were both replicants ?
Which is the whole premise of Blade Runner 2049.