theoretically, yes.

It saves a framerule, so yes.

its not that easy to do , it need pixel perfect and frame perfect inputs and has very low probability of success.

So does FPG and fast 4-2 (I think).

FPG and fast 4-2 has 30% success rate , but that clip is very hard trick to do

Yes, every any% framerule has been matched without left+right. The only thing left+right really saves is a few frames in 8-4.