It is possible that being good at adjusting later in life might not be caused by attachment but rather simply by a person's disposition/temperament. Having a positive mindset is very powerful when it comes to dealing with difficult situations. If asked to judge one's well-being, whether or not one has a generally positive outlook with greatly effect the answer. People are also more attracted to individuals with a positive mindset.
Also, if it were true that a child's attachment pattern is the cause of how a person adjusts later in life wouldn't that mean that a child with attachment issues would alwasy have adjustment issues? If so, this would disprove the theory because there are certainly individuals who had poor attachment with their mother but who went on to live perfectly adjusted and happy lives.
Yes I definitely agree. I know someone who's parents got divorced when he was very young and, instead of being broken up and always sad he is very happy and content in life. As a matter of fact he is better with dealing with certain issues, and he still have a great relationship with both parents.
I agree that how a child feels attached to their mother does not set them into a certain destiny in how they relate to others and their future well-being. They may have a certain disadvantage by not having a secure attachment to their mother, but there are other people in a child's life that can influence how their well-being will be in the future. Especially since children are most influenced at a young age, they have ample opportunity to improve their attachment styles. I agree that some children are born with a certain temperament that allows that to better handle not having secure attachment to their mothers and they handle it by figuring out a way to improve with others. A person's awareness and insight of their problems is often a big factor in how much they will improve.