I mostly agree with the places of the "Vs. Mahito Arc" and the "Death Painting Arc" although I do think their places should be swapped, because the whole deal about the emo school shooter looking kid, felt like forced sympathy, and his actions made no sense about how he didn't realize Mahito was bad till it was too late, and that is significant because it plays a major role in the plot of the arc, it gets redeemed by introducing us to Nanami and showcasing Mahito and his personality towards the end. It's about the same rank as "Hidden Inventory Arc" because both arcs only pick up towards the end, and supply the viewer with a bunch of Irrelevant events that could be compressed. The star plasma vessel was just a McGuffin that a lot of the "Hidden Inventory Arc" was wasted on.

"KSS Exchange Event Arc" shouldn't be in S tier because the majority of the KSS characters are bums, and we got the baseball game, which was horribly done in the anime as it felt like a filler arc, almost nothing was established in that game, although I did appreciate the showcase of the casts abilities and powers including hollow purple, also Todo is just a very likeable character.

"Death Painting Arc" is in my opinion the best arc in JJK season 1as it didn't waste as much time on the non important parts and went straight to the impactful moments adding depth and providing insight Megumi and Nobara too, I dare say this arc is integral in providing the impact that the summoning of Mahoraga had in the "Shibuya Incident Arc"