I agree it's a risk as many Bills fans, including me, don't think Tua is a game changing QB, so by moving out of the top 3 the Dolphins has lessened their chance to get Lawrence, Wilson, Fields or Lance who could be viewed as better than Tua. Yes, they acquired more 1st Rounders but it doesn't guarantee a top 10 pick that could be needed to get a franchise type QB especially with the 49ers likely to be better in 2021 with Bosa healthy maybe a better QB etc.
Yet the more high picks you have in your back pocket the better chance you have at getting a quality QB. I mean look at what happened with us in 2018 to get Allen.