I don't get the first 2 lines of the OP. Widow doesn't have gadgets but has some water then in the real round 1 has gadgets, what?
Round 1: Widow has the means to take out a non-power using Iron Fist via some weaponry, but that is easier said than done. If Danny closes the distance, and I think he has the ability to, she gets wrecked.
And round 2-3 are straight up mismatches. Widow has no chance at beating Danny when he has chi. And she is far below him in skill, he takes her there comfortably as well.
The P5 are tough characters to beat because of the fact that one was enough to beat up the Avengers and they had very specific weaknesses. The only things that were seem capable of stopping/harming them were each other, Wanda's hex magic, high levels of telepathy, Shi'ar weaponry, and Iron Fist's chi. Without it, they can be knocked around and made to bleed by physical force, but it never showed them slowing down. I know Maestro is smart, strong, and a tough customer. He might be able to fight one for a period (and lose), but not all of them at once.