For Ertz, the issue’s been consistency. Even though he’s averaged 790 yards per season over the last three campaigns, he’s had some of the starkest peaks and valleys of any fantasy tight end. For example, Ertz had eight games with five standard scoring fantasy points or less. And Ertz’s five career 100-yard games have all occurred in Week 13 or later, too late to be useful for most fantasy regular seasons:

https://www.profootballfocus.com/fantasy-football-player-showdown-tyler-eifert-or-zach-ertz/