AP stats and W/M defence

Fiel's extraction of PDD formula says:

X * 0.4 + (Y + Z) * 0.5 + W * 1.2

They're all accessed as pointer offsets though so there's no way of telling directly what each letter corresponds to. But it indicates that Y or Z is probably dex.

4* 0.4 (207+4)*0.5 + 35*1.2 = 149.1 WDEF

Only question that remains is - which 4 is which. I'd guess 4 int => 0.4, 4 luk => 0.5, but who knows.

So
a) 0.4*INT + 0.5*DEX + 0.5*LUK + 1.2*STR + DEF
b) 0.4*LUK + 0.5*DEX + 0.5*INT + 1.2*STR + DEF

Hmm that's interesting. Let's see..:

 Spoiler

He has 2+2+3+10=17 def on equips, so that leaves us with 38 def (unless his equips aren't avarage or scrolled, or that their defence is changed in KMST...)

So
X= INT
Y = DEX
Z = LUK
W = STR is what you think. Filling that in for this char is 61*0,4+(4+4)*0,5+4*1,2=33,2

Now let's change INT and LUK around:

X= LUK
Y = DEX
Z = INT
W = STR. Filling that in for this char is 4*0,4+(4+61)*0,5+4*1,2=38,9.

That means def is
LUK * 0,4 + (DEX+INT)*0,5 + STR *1,2 (rounded down)

Hm that collides with your W X Y Z = STR DEX INT LUK reasoning....