The SPY-3/SPY-4 Dual Band Radar (DBR) at this point looks like a dead-end. SPY-6 (with SPQ-9) is cheaper, more popular, and at this point, clearly "winning" in naval circles:
As a "refresher," here's the 2020 article I posted to you in another thread regarding the Zumwalt's possible radar upgrade:
Read it carefully. Nothing is etched in stone. The DBR on Ford failed to impress. SPY-6 in one variant or another looks to be a leading candidate, etc., etc.
"The reality" currently looks to be SPY-6 emerging as "a winner" in future fleet plans.