luffy faint from one explosion from apoop
Zoro faint from one stab from nerf killer
Sanji get leg broken still didn’t faint
Sanji got 5 colored string still didn’t faint
Sanji got knocked through 10 bulidings by hybrid ancient zoan still didn’t faint
Sanji got tail whipped by ancient zoan still didn’t faint
Sanji got diving speared by a flying zoan at light speed still didn’t faint
Anime only showed logical developments, there is no spoilers in those openings.
The same was with Denjiro, they made a pair of people in each frame and ofc in those images would appear important characters, Denjiro was a important character for what we saw until the reveal of his identity, so animators put him there and that's all.
You don't need to be Nostradamaus to guess a possible scene with all Strawhats, the damn main characters of the story, against the main villains of the arc, ohhhh, magic!!!!