I'd just say that the entire order of ships in the RM DD line is just messed beyond proportion. Before even suggesting a buff to use specific guns, the guns that are affecting the usability in the order of tiers needs to seriously be looked at. Also, everyone knows the Leone's single 6" are beyond overpowering as a DD1 in terms of its absurd velocity, range, and firepower (if anyone hasn't noticed, they hit like 7" actually), even a skillful DDX with single 7" will struggle as well within the DD category which shouldn't happen.
The truth of the matter is, the Z1 can never pack a punch to be seen as an incredible threat even with the single 5.9". Should you know by now, they have the weakest shell dmg let alone having a chance to get in range in either of the two contending ships with its best gunset. It's from that point is why people can't you seriously with that statement, trying to prove something that doesn't yield the potential in the first place simply doesn't construe a constructive debate.
Once again, if you can acclaim what you believe is right and surpass what Mako has addressed, then by all means. But chances are, I can attest to you that we've all been there and done that. And yes, Mako can prove screenshots of the Leone doing 70K+with only its gunset if you feel the need to be receptive about it.