Just to clarify,
While maybe not the norm, there are many triple cylinder two strokes with waste spark ignition.
It can still work with 120 degree phase cylinders if port timing is appropriate.
The number of coils is irrelevant if they are all wired to the same crank trigger.
My old Polaris xlt triple 600 snowmobile had 3 coils but they are wired together and you can put any plug wire on any cylinder just like any waste spark engine and it would make no difference. I did it many times while troubleshooting those machines.
This is not the best way to do it since factories sometimes use different timing settings for different cylinders to help aid the most deto prone cylinder from melting down. Same reason they sometimes jet one carb richer than the other in order to keep the detonation prone cylinder safe.
But since Fuji manufactured the xlt engine for Polaris, it was actually reliable unlike the junk they try and make themselves. (Sorry for snowmobile reference and brand bashing lol).