If people really use JS training for SF/PF version, I don't understand why they do it.
for 18yo, 183 cm guys it gives:
0.36 - JS
0.3 - IS
and very minor JR.
Even worse for taller guys.
Unless you really lack only IS and JS, I see no use of it for SF/PF. The better option for JS would be SG/SF or PG/SG. (0.53 JS, 0.16 JR and minor HN and DV).