User blog comment:Fire Eater/Differences between the manga and the anime?/@comment-1037137-20180711042723/@comment-26495049-20180716142512

Isayama did comment that he wasn't satisfied with the quality of the manga during the Uprising arc, and would change many things for the anime adaptation (which he followed through on, judging from Episode 1). So it's conceivable that he might do the same for the Marley arc as well.