I think JSF won't care about last WC, at all.
And about pressure, i think pressure was more on Shoma's and Keiji's shoulders. Kazuki was more the nice surprise who made it to worlds thanks to two withdrawals, and delivered.
I can see fed choosing Keiji even if he always bombs in big comps.
I'm pretty sure Kazuki skated his FS after Keiji had his usual issues keeping it together, so the pressure was definitely on as Shoma did not look like he was in good condition (and indeed wasn't) and nobody knew the final flight would bomb so hard that he'd be able to stay second even with a very messy skate. Plus, I think there is *more* pressure to perform if you don't know whether you'll have a shot at World's again.
Anyway, it's not as though the case for Kazuki relies only on his WC performance last year. He also medaled on the GP this year.
So someone having a bad trot this year, but who had a similar last year but really brought it in the last few competitions... they'd be mad not to fudge a little for him.