Yeah, I agree with that. Given that One Piece was 674K/409K 18-49 it probably would have topped 500K/345K 18-49!
Here are the show averages so far:
SHOW AVERAGES SO FAR
Dragonball Z Kai - 1,378,326 (92 episodes)
Jojo's Bizarre Adventure - 1,055,333 (3 episodes)
Gundam: Iron-Blooded Orphans - 962,500 (20 episodes)
Hunter × Hunter - 930,077 (26 episodes)
Naruto: Shippuden - 895,694 (134 episodes)
One Piece - 807,689 (160 episodes)
One Punch Man Rerun - 697,500 (2 episodes)
ADULTS 18-49
Dragonball Z Kai - 794,837 (92 episodes)
Jojo's Bizarre Adventure - 642,000 (3 episodes)
Gundam: Iron-Blooded Orphans - 572,850 (20 episodes)
Hunter × Hunter - 546,538 (26 episodes)
Naruto: Shippuden - 494,161 (134 episodes)
One Piece - 439,026 (160 episodes)
One Punch Man Rerun - 438,500 (2 episodes)
ADULTS 18-34 (Estimated)
Jojo's Bizarre Adventure - 419,333 (3 episodes)
Gundam: Iron-Blooded Orphans - 380,300 (20 episodes)
Believe it or not, with a 0.57, roughly 387K, Gundam IBO did better in 18-34 than it has since Episode #15, the last time it topped 400K. Meanwhile, JoJo stays above 400K, which is pretty good. One-Punch Man's rerun's average is of course unchanged since CWCLV took its timeslot, with roughly a 225K in 18-34, which is really not THAT bad for 3 AM! We'll never even have a clue how Hellsing did in that timeslot but I'm pretty sure it blew it away to the tune of like 300K-350K 18-34, not to mention One-Punch Man is probably pulling close to that in that timeslot in reruns!