I don't really think that SFs need better Inside Def. than Outside Def.
Why is it that you believe that SFs need better OD then ID?
i would add, that JS is even with inside shot very powerful weapon of the SF, where IS isn't much important for the SF when you play outside tactics(like JR in inside). So you always have to defend his Jumper, and if you shot down hs jumper, you make him work less efficient.