No, the bottom of all four output displays would have an extra ~8ms of delay on top of any native delay. It's unavoidable (unless you can use seriously non-stan

No, the bottom of all four output displays would have an extra ~8ms of delay on top of any native delay. It's unavoidable (unless you can use seriously non-standard timings) as each players output display takes ~16ms to scan from top to bottom, while the n64 takes ~8ms to scan from the top to bottom of each player's view. You can avoid (additional) unequal treatment by adjusting the timings of the bottom two players so their TVs start scanning out the top line right after the n64 scans out it's middle line.