You wrote good points in your post about the topic.

For instance, blockchain have the system of smart contracts which can allow devices to work more anonymously and securely by establishing contracts which can only be executed with the exact criterias used in the contract.

This is something I also wrote about in my post, with block chain data stored on IoT devices would be secure and becomes very hard or impossible for outsiders to hack in to steal or manipulate your information. Blockchain will add more value to IoT and I wish you the best in this contest.