It isn't that complicated.
As much as it would suck for Tua to have habitual hip issues throughout his career, if the medical comes back clean and that's your guy, make the move and get him
If you are so worried about the injury that you lose conviction on the guy, then pass on him all together.
The thought process that "only if tua falls to 5 we should take him" isn't realistic. Miami should be calling all 4 teams to see what terms they require to trade up.
I'm not saying there isn't a limit, but if I feel confident in my final evaluation of Tua . . . 5/18/26 is not a deal breaker, but of course I wanna trim that as much as possible.
Get your guy Chris and if you settle on FitzRosen in 2020, know that it absolutely counts as a QB selection under your watch.