It depends, because that strategy only is trully useful against Omega Mark II, I have tried it against other bosses like Yiazmat and Zodiark and it's a resoundful fail, especially against Zodiark :P
So I guess that Reverse and Decoy is really more of an experiment to see how gamers are paying attention to all the spells they are using, instead of using the same ones over and over again (Shock and Purge i'm looking at you).
Current PC Build
CPU - i7 8700K 3.7 GHz (4.7 GHz turbo) 6 cores OC'd to 5.2 GHz with Watercooling (Hydro Series H110i) | MB - Gigabyte Z370 HD3P ATX | Gigabyte GTX 1080ti Gaming OC BLACK 11G (1657 MHz Boost Core / 11010 MHz Memory) | RAM - Corsair DIMM 32GB DDR4, 2400 MHz | PSU - Corsair CX650M (80+ Bronze) 650W | Audio - Asus Essence STX II 7.1 | Monitor - Samsung U28E590D 4K UHD, Freesync, 1 ms, 60 Hz, 28"
