The best way to show you how debuff can affect counter team need to be shown in raid boss event since there are plenty under controllable elements like boss lv. and weakness. But we talking about 2.5m vs 2m here. (replace Epidendrum with Nightmaher)
Or well, I guess only Wutan would be able to tell you how good or bad the team actually is, I can only give some on how debuff help counter more effective here.
Edit: Damage comparison, but be sure to take into mind that Saffron is the key here. The longer she can dodge means she can dish more counter. We need more sample space here, that's obvious.
and one without debuff
Just 1 team against lv.235 raid boss.