[Touko]

Originally Posted by Yusei Fudo

For the Holy Grail, I thought its gigantic monstrous looking form would come out (the form that appeared in Heaven's Feel), but I guess not?

Not really. The Heaven's Feel scenario is kind of unique.

Spoiler:

The way the events unfolded led to Sakura's psychological collapse and her berserkering, which paved the way for Angra Mainyu's manifestation. For all the other routes, even though the conditions were similar, Angra Mainyu would not manifest. The Fourth War did not have the false Grail, and I think Angra Mainyu was also not fed well like in Heaven's Feel (where Sakura/her shadow ate a ton of people).