I believe Hayato is possible, just very difficult. You have to be very precise and patient as you make attempts. I think the Hayato thread has a few posts with tips. I’ve linked the most recent one I found: Hayato - ROW DTLA - #1090 by Armillaria. 2 is the maximum reservation via Tock based on the reservation page. Personally, I think Hayato is one of the best in LA and special even vs. similar style restaurants in Japan. Definitely top tier bucket list in LA. But I’m a fan so take note of my bias haha. 
Food is going to be subjective so for some they will prefer one over the other. I’ve been to Manzke once and Kato 2.0 twice and think I actually prefer Manzke. I’ll echo hippo’s opinion that I found the average at Manzke higher. Kato had a few dishes that fell flat for me, though some dishes I think I liked more. Haven’t been to either in a while though. I will say Kato had a great drink program. I still dream about that Milk Punch and I enjoyed the non-alcoholic pairing a lot.
If I remember right, Manzke has increased pricing on weekends. Looks like $30 increase. Either way, both Kato and Manzke are easy reservations if you decide for one of them.
Too bad the next version of Somni’s not open yet. I’m guessing they’d end up on an LA bucketlist whenever they’re up and running.