I think it’s hazardous to infer anything from those verses.
1. The prayers could easily have been only their prayers while in their mortal bodies on earth.
2. The prayers could easily have been exclusively devoid of any awareness of current goings on, on earth—particularly in any personally specific detail.
3. The prayers could easily have been exclusively YOUR WILL BE DONE, OH FATHER; YOUR NAME BE GLORIFIED, OH FATHER; YOUR SON REIGN SUPREME, OH FATHER etc.
And when those beasts give glory and honour and thanks to him that sat on the throne, who liveth for ever and ever, The four and twenty elders fall down before him that sat on the throne, and worship him that liveth for ever and ever, and cast their crowns before the throne, saying, Thou art worthy, O Lord, to receive glory and honour and power: for thou hast created all things, and for thy pleasure they are and were created. - Rev 4:8-11