So much this. Another reason why diversity within coaching (background, experience, style/system) is important. Kenyan Drake was never a featured player in Miami's offense, yet the Cardinals value him enough to franchise tag him. 10 years ago, Lamar Jackson's ceiling was probably ... Taysom Hill? No way he's drafted in the 1st round. A league full of prototypes is boring as fuck. Josh Rosen still may not be incredibly likable, but he's, without question, talented. He flashed enough, especially during the preseason; and top 10 picks rarely fail due to a lack of ability. He turned 23 three months ago.
With so much money at stake in football, (most) coaches are given far too little time to win. As a result, they have to make lightening quick decisions on whether a QB is worth investing in -- time, resources, etc. A QB largely impacts who you hire as an OC, and the type of skill players you draft and acquire via FA. The Cardinals moved off Rosen after he stated 13 games with the worst roster in the league. That's like being forced into taking a leadership position within an organization that's in the process of burning (metaphorically), and then being fired at the end of the year because, hey, we need to clean house! What if Rosen had dropped to the Chargers or New England?
Josh Rosen's making chump change right now, so I'd be fine with Miami keeping Rosen as the 3rd QB this year and then having him be Tua's primary backup in '21. As we've seen before, anything can happen, so who knows? There's an injury, suddenly he's starting, and boom -- it all clicks. The issue for Miami's FO is the 5th year option, which is never going to be considered by the Dolphins, unless something drastic were to take place. Thus, as far as maximizing a return on draft capital, dealing Rosen following a strong preseason is probably the way to go. Though, what's that likely to get you -- a 4th round pick? Personally, I'd rather have the cheap, young QB for 2 seasons.