Powerscaling doesn't have to make sense. It's like a dick measuring contest. It's just fun discussing who beats who.
To your point, yes it does make a difference having or not having 8 gates. Because, if guy hadn't stalled madara, they would all be dead right there. It could be the difference between your comrades surviving or dying.
Again I see your point but even that isn't true since Minato kakashi and Lee still had to be use to stall in this scenario.
Gai ended up damaged
Madera was alive healed and was fine
Naruto still had to save gai
Naruto still damaged Madera without having to kill himself.
Again 8 gates is great but it's terrible to use in a powescaling debate since you die.
Are we using the androids ability to detonate as a universal power scaling feat? No.
Do we use one piece hax to power scale offense and defense capabilities? No
Same applies here