Attachment is a theory of communication and environment: a baby's personality depends on what happens, not who he or she is biologically, or any supposed drives. It is dependent on observation rather than literary questioning and theorising. It is also a theory that extends to adult behaviour, so that romantic love is a behaviour-adaptive system (Hazan and Shaver).
This relies much on adult answers and therefore subjective impressions than observations!
The question is, are the two connected? Is the baby experience with the carer and more a determinant of the adult relationship that takes place? (Hazan and Shaver 1987) (Feeney & Noller, 1990)
This question is somewhat speculative.