The only problem I had with the BP-Panther fight was that Namor never really got a chance to fight back, and that BP's tech was just kind of random and out of nowhere, not something we've seen before, or even some thing that was really made specifically for Namor like a dehydration weapon or something: it was just generic power/energy claw gloves. I just wish it had been cooler.
The Green Arrow stuff looks great. I'm kind of glad their run is ending, only in the sense that now I can go out and get it all collected together.
T'Challa's sister has shown that Wakanda has dehydration tech and has used it to beat Namor with.
Oh I totally believe they would have it. I have no doubt that T'Challa, or Wakanda in general, with prep can beat Namor. I just wish they had been more specific about what he was using here, it would have made it more interesting.