but since they are banned, riot doesn't have to nerf them for pro, hence they are in a good spot in soloq.
And I don't think the differences between for example the top 4 top laners and the next are so huge as the 10th 11th 12th top laners and the 13th top laner.
I think it's like the ladder, the top people have significant amounts of LP difference, but if you go and check between the 2000th 2001st 2002nd they might have 1 or 2 lp difference.
It's usually like a bell distribution pattern. Very thin in the top and bottom and more wide the more you approach the middle.