While Ziggy has soft hands and is a pretty good route-runner, he lacks critical skills/abilities for this offense that will limit him from being anything other than a #6 WR, if that.
1. Very thin build - lacks strength in the blocking game. He's not terrible, but he's not good either.
2. Continuing on that point, lacks physicality to create separation either in getting open, or in battling for the pass, and will lose that battle to more physical corners, even if they're smaller than him.
3. Is not considered a deep threat, not a burner, and isn't going to scare any team into backing off because of speed. Combining his lack of strength and great speed, Zig is not a great RAC guy.
4. He doesn't bring the KR/PR value that Williams and Johnson do. And no, just because Sing put him there one time because we had no one else, that doesn't count.
Tack on all this to him coming off a season-ending injury and it just doesn't appear to be a great scenario for Zeigler. I don't think he'll beat out Johnson, and he'll have to compete likely with UDFA's being brought in too.
Johnson was a great value where we got him. He was known for his ability to get open, and make the spectacular catch. His problem was the wide-open, easy catches that he would drop due to a clear lack of concentration. Kid would've probably had close to 1000 yards if not for several drops when he was wide open deep down the field.