I really don't think "Kashimo vs Yuta" is that close of a matchup.
I see people constantly putting Yuta at top 3/ having him as a top 3 contender, but I heavily disagree with that not because I think he's weak (I have him at top 5) but because both Kenjaku and Kashimo are that much stronger.
My first point are their stats, CG Yuta was stated to be slightly below JP Hakari's level with his stats getting higher in Shinjuku (it doesn't seem like the increase was massive but still) so I'm going to assume that Shinjuku Yuta's stats are more or less equal to JP Hakari's. For Kashimo, his stats are also around JP Hakari's, so I believe it's safe to assume that Kashimo≈Yuta in stats, but then MBA comes in.
This part might seem like a stretch but bear with me here, the Meguna that Kashimo fought was able to keep up with him meaning that Injured Meguna≈Kashimo, but when Kashimo activates MBA Meguna isn't really able to fight back anymore, with that logic I'm going to assume that MBA puts Kashimo at least one tier above other Heavy Hitters, so he would dominate Yuta in hand-to-hand combat (I don't believe Rika to be much of a game changer so I don't know what to say about her)
The second thing is Yuta's domain, I see people bring up domain-diff a lot when it comes to Kashimo, but I think that even if Yuta did manage to use his domain (I don't think their fight would get to that point since Kashimo is a close range fighter and I think MBA makes him physically superior, but it would be unfair to not consider that option) Kashimo has HWB and doesn't need to use his hands to fire EM waves, meaning that he can maintain a stronger version of HWB and fight back at the same time. The only issue in this scenario is Rika, but like I said earlier I don't think she would change things that much (I'm not going to argue whether or not Kashimo can destroy her)
P.S. I'm not too big on powerscaling so forgive me if some things don't make sense.