The New Orleans Saints have been decimated by injuries in recent years, especially at wide receiver. Injuries to Chris Olave and Rashid Shaheed decimated their passing attack last year. Realistically, the Saints aren't too far from where they started last year.
New Orleans had to pick up Marquez Valdes-Scantling in the middle of the year to be their top wide receiver. The offseason addition of Brandin Cooks gives you another reliable option in case there is injury. Though the Saints are an injury away from having just two sure things at the position.
Each of the top three receivers spent significant time on injured reserve last year.