Holy moly. So you think the 24 elders are interceding for you?

The rest of that doesn't help, it's literally the saints crying our for vengeance to the Lord directly.

Notice they are doing it directly to the Lord, not telling Mary to tell Jesus....

As far as your OT examples all of them are still alive. I mean I can pray for you and you for me. That is a thing but the question is to whom am I praying?

Once again, the saints can't hear or answer your prayers. I mean if you want to interpret that revelation passage literally then they are holding vials that contain prayers so God can smell them. In the context of the OT its like incense, it's a sweet savor that pleases God.

Still implies that he is the one smelling (i.e answering), not the elders. So them prayers again go directly to God.

You are missing a huge point. There is a major difference between me praying for you verses to you...and for me to pray for you I have to be alive.