All the things
Yeah, there's definitely something up with lag or otherwise. GTimeKiller's TAS is a bit more optimized than Dark Fulgore's, but still has several poor fights. There are only 3 parts that are not possible consistently in real-time (Elevator shaft skip in 3-2, rock skip in 4-2, lava pillars + earlier skip in 4-3), and frankly getting 1-cycle En-Mikoshi and Shura-Oh outweigh or equalize those benefits. Yet somehow he gains 12 seconds on Stage 4 and 13 seconds in stage 5. Maybe lag plays a much bigger role than I thought? Optimized movements should account for only 2-3 seconds in each stage, so it's just really odd to see times that quick with very few differences in the routes.