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Centurion at Capernaum is NT but that's only one Hero compared to your opponent perhaps running a NT offense, I love the addition of RDJ.You also have Trumpet and Sword, which can eliminate a Coliseum if you want to try and use RDJ for the ability.Foreign Sword would probably be an upgrade over Eleazar's Sword. Ishmaiah and Ahimelek are two of the strongest Red Heroes right now.
Ah right, Red/Teal is certainly viable but that changes the deck quite a bit. Sticking with straight Red is fine.
Not knowing what you have available, it's tough to say. David's Triumph and Centurion's Proclamation are both really good. A Soldier's Prayer can be a second use of whichever GE you need. Counsel of Abigail is also a solid battle winner.
With Trumpet and Sword in an all-Red offense, I'd make sure to include Uriah.Demons can give an all-Red offense problems. Freedom! and Faith of Barak could be good additions to mitigate this.