From the video

Video: League-Winning 3rd Round Fantasy Football Targets & FADES
The reason why I think people don't view it as as much of a linear progression is that the routes, unfortunately, have declined despite him in in him getting much better... the reason why he keeps underperforming his peripherals is in part routes um, and in a large part it's just touchdowns. He is just not gotten the end zone targets

STACKED’s take

Positive signalUsage

Flowers has underperformed his peripherals due to limited routes (declining from 588 as a rookie to 470-479 recently) and lack of goal-line targets, but has clear opportunity for improvement.

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