If you'll let me give my input on Harbor:

1. tuyz
2. Mazino
3. f0rsakeN
4. JitBoyS
5. xccurate

I fully agree with tuyz at #1, he's undoubtedly the best Harbor in the world right now. I'd actually put Mazino at #2—I don't know if you forgot about him or just left him off, but he's been playing Harbor amazingly for Leviatán and he's been a decent factor in the strength of their Icebox. Then I'd just move f0rsakeN to above JitBoyS, just because he has a lot of experience with him, which he's shown this split (e.g. his cove placement in Paper Rex's Bind games).

Great work on this post, by the way! Pretty solid takes all around.

I recommend trying out KAY/O. He was a lot easier for most other initiators for me to pick up, and he's amazing at setting up your team. You have a lot of consistent, guaranteed value with him regardless of how you perform, simply because of how his kit works. And the way he's played feels to me similar to Fade's in how aggressive you should and shouldn't be and what fights you can take.

He's also in a really good spot in the meta right now. He's always been amazing on Ascent and Breeze, but I'm seeing quite a few pro teams use him on several map's, so he's seeing decent play on pretty much every single map in rotation with the exception of Split and maybe Lotus (though we could be losing at least one of those maps within the next month).

I do suggest you keep your options open, though. Fade is still a great pick on both maps KAY/O isn't seeing much play in, so definitely keep her in your agent pool. Learning Cypher also isn't a bad idea, especially if you need to fill sentinel. Diversifying your agent pool and having a few picks for each map instead of just one isn't a bad idea, the way I see it. That's coming from a low elo flex player, though, so feel free to take that with a grain of salt.