5 blade vs 7 blade clutch fan

I would keep the 7 blade aluminum fan, it will move plenty of air, Plus it's aluminum!
It makes sense that more blades move more air but that actually may not be the case. I personally don’t know. But it makes me wonder, if such was the case, then why didn’t MP have it for sale and suggested use in the catholic and books.

There may be something to that weird 5 blade off set fan. Who knows? All I can say is when I swapped fans to help cool my engine, ther was a huge difference between the stock one and the MP viscous fan by Hurricane standards!