I don't have dresden files, but...
Stack vs Pyramid:
Pinnacle of performance (as good as you can get)
Good (15) Great (20) Superb (35)
Pyramids 5
4 4 4
3 3 3 3 3 3
2 2 2 2 2 2 2 2 2 2
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
10 skills 10 skills 15 skills
Stacks 5 5
4 4 4 4
3 3 3 3 3 3
2 2 2 2 2 2 2 2
1 1 1 1 1 1 1 1 1 1
8 skills 8 skills 14 skills
It won't break it, but it does result in more narrowly focused skill sets. However, in all cases, a stacked mode feels more arbitrary, since one could, with those points, buy higher levels than the level limit. With pyramid mode, the rule of the pyramid sets the upper limit simply by point totals; with stack, it doesn't. If ignoring the implicit level cap, some odd things can happen:
Good: 5 4 3 2 1 = 15 points, 5 skills
Great: 5 4 3 2 2 1 1 1 1 = 20 points, 9 skills
Superb: 7 6 5 4 3 3 2 2 1 1 1 = 35 points, 11 skills
So it is both not as easy to remember the level limits, and if ignored, the level limits can break it pretty quick.
However, there is a big flaw in stack systems: experience.
If I have a stack of 3 2 1, and want a 4, I have to make the following series of raises:
A B C D E
- - - - -
3 3 3 3 3
2 2 2 2(2) 2 2
1 1(1) 1 1(1) 1 1 1 1(1)
F G H I
- - - (4)
3 3 3(3) 3
2 2 2 2(2) 2 2 2 2
1 1 1(1) 1 1 1 1 1 1 1 1 1
after advancement, however, a pyramid looks more like:
A B C D E
- - - - -
3 3 3 3 3
2 2 2 2 2(2)
1 1(1) 1 1(1) 1 1 1(1) 1 1 1 -
F G H I J
- - - - -
3 3 3 3 3
2 2 2 2 2 2 2 2 2 2 2 2 2
1 1 1(1) 1 1 1 1(1) 1 1 1 1 1 1 1 1 1 1 1 1(1)
K L M N O
— - - - -
3 3 3(3) 3 3 3 3
2 2 2 2 2 2(2) 2 2 2 - 2 2 2 2 2 2(2)
1 1 1 1 1(1) 1 1 1 1 1 - 1 1 1 1 1 1 1 1 1 1(1) 1 1 1 1 1 -
P Q R S T
- - - - (4)
3 3 3 3 3 3 3 3(3) 3 3
2 2 2 2 2 2 2 2 2 2 2 2(2) 2 2 2 2 - 2 2 2 2
1 1 1 1 1(1) 1 1 1 1 1 1(1) 1 1 1 1 1 1 - 1 1 1 1 1 1 1 1 1 1 1 1
So after advancement, a stack looks like a pyramid, and a pyramid widens out.
If you use the pyramid in character generation, and stack for experience, you won't be breaking anything.
Note also: A character who advanced from good to great is VERY different than one who started great.
Getting A Legendary
The needed pyramid in LoA is thus:
Initial build Experienced way up to it
8 = 8 8 = 8
7 7 = 14 7 7 = 14
6 6 6 = 18 6 6 6 6 = 24
5 5 5 5 = 20 5 5 5 5 5 5 = 30
4 4 4 4 4 = 20 4 4 4 4 4 4 4 4 = 32
3 3 3 3 3 3 = 18 3 3 3 3 3 3 3 3 3 3 = 30
2 2 2 2 2 2 2 = 14 2 2 2 2 2 2 2 2 2 2 2 2 = 24
1 1 1 1 1 1 1 1 = 8 1 1 1 1 1 1 1 1 1 1 1 1 1 1 = 14
36 skills total = 120 57 skills, total = 176
I find no other limits in the rules (but I'm still reading through LoA), tho' in either case, it's going to be a LOT of sessions later...
However: if you have a stunt that allows a free tag, a 6 within the scope of the stunt is a base 8.