>Also, possessive pronouns are exactly like in English, concording in gender with the owner, not the object.

This is only true in third person singular. For example, in first person singular: 'моя чашка' (my cup, 'cup' is feminine) vs. 'мой ключ' (my key, 'key' is masculine). Third person plural: 'ихнее дело' (their business, neuter) vs. 'ихняя забота' (their concern, feminine) although most educated Russian speakers would object to these pronouns as a bit too colloquial (although not as colloquial as 'евойная'). Same in second person singular: 'твой друг' (your friend, masculine) vs. 'твоя подруга' (your friend, feminine). In all of the examples above, the gender of the speaker/owner cannot even be determined (grammatically speaking).