That passage does not say dead saints are interceding for us.
What does it say then?
Fellow citizens and saints with the household of God. The household of God would be Angels, who serve in the presence of God. We, both physically and spiritually alive, are citizens with the angels. That is pretty clear, and I am using the KJV.
What value is it to be a fellow citizen with angels, whether in flesh or spirit, if we can not aid another?