Talkign about normal members on forums i visited who reviewed the film. I konw some of em were anxous before movie relased coz they werent sure how a movie liek FPS could translate, and they reviewed it was quite differnet from the book.
I'm sure there were similarities, which is why he's given credit at all. LIke i said, gray area starts with teh questino "how much credit"
He didnt write the script, script writing, screenplay, dialogues are hirani.
But his book was the premise for the movie, it lent inspiration with the characters and settings. Makers felt that this was not enough to put his name right up with the director and producer. They did tell him in teh contract it would be inteh "rolling credits".
From what i know, rolling credits come at the end of the movie.
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