Yes of course Paul ask for others to pray and prays for others.
But you neglected to mention that Paul only speaks of praying for or requesting prayers from people who are alive.
But the main point of the verses is that ONLY Jesus intercedes for us.
You forget that death does not separate us from Christ. We remain part of the Body even after our physical death. Those in heaven are even MORE able to pray and intercede for us.
Intercede = pray for...
Regards