So looking at this as 2 rounds (I'm assuming that people can at least pass turns if they have no buffs)
Team dude | Mei-Ling, Feena, Aika, White Rose, FFT Monk (Vantage)
[Feena: All Eggs]
[Floor 4b: Buff Enough]
*On this floor, all buffs have their effects increased by 50%, debuffs by 25% and the first two rounds of both the enemy and player must be on buffs or debuffs, which does not include status.
Team dude vs. Cray, Nina4, Scias and Ershin- Buffs will be Nina 4 cutting magic on 2 by 75% and Cray Attack buffing Scias twice. Dude gets 4 castings of Lightsword (which...well, actually, I don't know whether these get Shiningblade though. I don't believe Shiningblade is gotten by evasion, and I know that Deflect has moves that ignore it).
So this may change absolutely nothing from before if Shiningblade ignores Deflect.
Team dude vs. FFT Samurai, Time Mage and Squire Ramza- This team gets a lot better since now Time Mage will end up hasting the team, which will all be Shell+Protect. Ramza gets more Speed for lolz. But time to buff means that Ramza's ST physicals are eaten. The fight is slower, but better now.
Team dude vs. Aeonless Yuna, White Wizard and Priest (FFT)- This team gets scary. Priest is already very hard to kill coming into the third turn (Cuts physicals 75%, cuts magic 75%, Cuts elements 75%, And 60%? Evade). And it will just get worse as time goes on.
Team dude vs. Arnaud, Yulie, Lilka and Emma (AC:F)- Time to Lightsword is great and such and takes the danger out of the fight.
Team dude vs. Adachi, Alexia (XF) and Alma- Oh god, this fight gets to much worse. So now before his move, Adachi will be MBarriered (halve damage, hasted), Heat Riser (cuts damage another 40%) and with multiple attack buffs. This one is a loss now since the team gets a turn to get Adachi out. This normally isn't too bad, but MBarrier puts Adachi at about 2 PC HP durability and Heat Riser bumps this up yet again. And the fact that the enemies have two distinctly stackable haste buffs helps (you could see Heat Riser and M-Barriers defensive buffs as not stacking, but in XF Royal Cheer and Haste should stack, so that's good to go).