Hi waffle, how you been, its good to see you're lurking in the backgrounds
I really don't want this to be a tit for tat posting, as I myself want to limit my exposure on here as I have a lot that I want to pursue, and I'm already caught up with Kam, not sure for how long, I might just drop it.
Anyway I think much of your post has been covered by my posting to Kam
So I'll just answer this bit for you
He will ask the Father to send another Advocate. As there is only one Holy Spirit the Advocate must be another Messenger like Christ who will be supported by the Holy Spirit as Christ was.
- The Holy Spirit has various titles in the bible, including Advocate, Comforter, Paraclete, Spirit of Truth, Spirit of God, Spirit of the Lord, Spirit of Wisdom, Spirit of Understanding, Spirit of Knowledge, Spirit of Counsel, and Spirit of Fortitude.
And The Holy Spirit roll has played a significant role throughout salvation history: in the creation account, hovering over the waters; guiding and empowering the prophets and leaders of Israel; inspiring the authors of Scripture; descending upon Jesus at His baptism; animating the Church at Pentecost and guiding it throughout history; sanctifying believers through the sacraments; and dwelling within each believer as the source of grace and advocate. The Holy Spirit continues to work today, guiding the Church, sanctifying believers, and empowering them for witness and service.
No need for any other in filling the mission for the salvation of souls, as Jesus in His unique role in God's plan of salvation so also is the Holy Spirit by sanctifying, empowering, and guiding believers, until the end of time
The Father, Son and the Holy Spirit are inseparable and work cohesively in the economy of salvation.