Have dreamt with a guy 3 times consecutively,the dream has been the continuation of 1st dream;then early next morning I saw his posture standing right in front of me?

Dreams have NO predictive capabilities.

They are merely your subconscious uploading data to your conscious mind.  You may not have consciously noticed the guy before, but your subconscious mind takes in far more detail than your conscious does.  So he was around, but you didn't notice him.