also there's a sixth cpu dedicated to doing sound but that was the norm at the time
apparently they might've been planning genesis back-compatibility because they used the 68000 as the audio coprocessor in the saturn, the same chip as the cpu of the genesis (this was common; the ps2 used the ps1's main cpu as an audio coprocessor which enabled near-perfect ps1 back-compatibility, and the gba did the same for the gbc)
-F
@Felthry I guess the processors were similar enough that you could offload background stuff to them if you wanted to, but I can't imagine it would simplify anything considering the synchronization and communication would be so complicated. was the cache shared at least?