That's pretty hard to square with this:
John 14:12
Very truly I tell you, all who have faith in me will do the works I have been doing, and they will do even greater things than these, because I am going to the Father.
And then there's this (Acts 5:15-16):
"People brought the sick into the streets and laid them on beds and mats so that at least Peter's shadow might fall on some of them as he passed by. Crowds gathered also from the towns around Jerusalem, bringing their sick and those tormented by evil spirits, and all of them were healed."
And it's not as if anybody has "powers" independent of, opposed to, or in competition with Christ. Everything comes from Christ. It is through Him and by Him that Peter's shadow could cure the sick and Paul could raise the dead. I think we can agree on that.
Show me any prophet of God, any apostle, any believer named in the bible praying to the dead to intercede on their behalf. Show me any prophet of God, any apostle, any believer named in the bible praying to anyone but God. Show me the verses where Jesus instructed people to pray to dead saints so they could intercede on their behalf.