Not every wide receiver has the upside to be the overall WR1 in fantasy football formats. It's just the truth.
Some won't see enough volume. Some aren't ever going to be efficient enough. It's just the way that it is.
But just because someone may not be able to put up league-leading fantasy point totals doesn't mean they're irrelevant in fantasy football or have "no ceiling."
That said, we always would love to have some tangible upside from our draft picks.
Especially when that pick is going inside the top 30 at his position, as Chicago Bears receiver Darnell Mooney is (he's the WR29 in FanDuel's best-ball formats).