Whilst I agree that Shun has been underscored over the course of his career, I think lately he's been scored really well, certainly much better than Kazuki. Furthermore, it was in justifying the choice of Shun (5th at Nats) over Kao (4th at Nats) for 4CC, that JSF mentioned their infamous

strategy

and 'the points we want to increase'.
So while Shun is certainly not the main beneficiary, he is included whereas Kazuki is excluded, and the most logical explanation is that this is due to a difference in age rather than a huge difference in skill. So their situations are completely different, and these days I
wish Kazuki was treated by the fed and judges in the same way as Shun
I have finally seen both the SP and FS of Tatsuya and Kazuki, and have to agree with you 100%. I really enjoyed both of his programs, and barely remember the two mistakes. He was a joy to watch, and both programs flowed fast, my concentration wasn't slipping even for a second.
I would like to see Kazuki's artistry rewarded more. Yes, he's rightly ahead of all others in PCS, but not as much as he deserves IMO. While I have nothing against Tatsuya (or Shun), watching Kazuki was a whole different level despite the initial mistake, light and fast and flying over the ice where the other looked OK but labored and not such a natural.
I'm with Kirara here, to me as well, Kazuki was underscored on PCS (should have been very close to 9 overall in all categories save maybe choreo), and on GoE. I don't understand the difference in GoE between Tatsuya's FS and Kazuki's. If anything, other than the initial mistake, Kazuki's elements looked more effortless to me.
I also agree with Kirara on Shun being underscored in relation to Kao (I guess it can be attributed to Kao being super fast). But not in relation to the older boys like Kazuki and Sota. Him getting higher any PCS (other than choreo) than either of them is a joke to me, sorry, and same for spin and step GoE. To my eyes, and those of some commentators I heartily agree with, he's behind them in expression and emoting, posture, extension and arm/hand tension, spins, acceleration, smoothness, and glide, Nope, not underscored IMO. If anything, I'd have him a full point behind Sota and Kazuki in PCS, but we're seeing the exact opposite as long as he hits his jumps. Typical example of PCS/GoE of everything tied to jump success/cleanness IMO. Thank heaven they're not doing the same for Shaidorov yet, and he's scored accurately. Where I'd diverge from Kirara's opinion is that I think Shun is not being supported on PCS/GoE because of his age, but because of his consistency and jumping skills. Of course, his age doesn't hurt if one is JSF planning a strategy for the future...
(If any smileys as a disagreeing reaction to my post, frownies please if I may ask a favor; I don't understand the meaning of these weird 'Think' smileys that don't really tell anyone anything.)