Sothis was ahead of everyone else with that remix, clearly.
It's not a back & forth at all though because Arval's only contribution worth actively shutting down is the guard debuff. It's a ton of Res and Guard is no slouch, but also every thing else is significantly more important. Anyone who is prioritizing Arval over Catria, Hardy Fighter armors, Duma, etc etc deserves to get owned. Yeah that means Arval can sneak in some extra support you can't turn off but that applies to any unit who isn't getting elimine sniped because there's always a bigger fish.Arval, shot for shot, can keep ahead of Elimine in the Res-comparing game. Duality alone puts Arval at an 11 point lead over Elimine of equal merges and boon, so not even Phantom Res can cover the gap.
A max +Res Elimine with Still Water and Fortress Res on seal can creep one point ahead of a max +Res Arval with Duality.....but an open seal slot.
Basically, Astra season is back to being a back and forth. Even Bride Catria can sneak ahead of Elimine with an appropriate kit and Arval buffing up that Res, so Catriaball's coming back for that season.