Not sure why people are so lukewarm on Palmer. He stands to be a near-every down player in a high volume passing attack with a stud QB. I'll take that shot, thank you.
He put up 800 yards as just an occasional starter last year in a less than great season for Herbert. And, oh by the way, not trying to predict injuries, but Keenen Allen is a higher-than-normal injury risk if you look at his career track record, and he's now 31, so...
Johnston is certainly intriguing as a prospect, but there's just not enough sample size to say much about him except that he's been running well behind Palmer in the pecking order. Like others have said, he's likely to be a situational deep threat that gets some of the deep looks that Mike Williams would have gotten. Other than that...?