I noticed something interesting maybe you are supposed to use the next 7 letters to get the first ie
BNYPVTT and GWKPFZM this would only make 7 words tho
using a alphabet square without the “Kryptos” in it
B G=H +1=I
N W=J
Y K=I
P P=A
V F=A
T Z=S -1=R
T M=F -1=E
B M=N
N Z==M+1=N
Y F=D +1=E
P P=A+1=B
V R=M -1=L
T W=P
T G=Z
It’s just an oddity I don’t know if it means anything What do you think?