I'm a Chiefs fan, I'll say that first. I was bouncing off the walls when we traded up to #10 for Mahomes. You guys want Tua to be Mahomes, but there are a few differences you're ignoring, willfully or not.
A team that takes Tua top 5 and doesn't have a mentorship plan for him is asking for failure. The Chiefs drafted Mahomes to be the QBOTF (not expecting him to put up the numbers he did in 2018) when they already had a decent QB in Alex Smith. Alex was an absolutely awesome mentor for Mahomes, knowing that he was teaching the guy who would take his job. Mahomes could take a year learning the offense, learning how to lead, and learning how to learn in the NFL. The Chiefs wanted him not just because of his arm strength, but because of his ability to memorize and repeat information, but that still takes time for an entire playbook. A QB has to know every aspect of every play to be as good as Mahomes was in 2018, as good as Brees is, as Brady is. Tua's got the physical talents to be good, but Geno Smith looked good enough for some (moronic) Chiefs fans to want him a few years ago, too. I was absolutely not in that boat. Beware of the teammates making a decent player look amazing. (Ryan Leaf, Julius Peppers made Ryan Sims look good and the Chiefs passed on guys like John Henderson and Dwight Freeney... they even traded up to get him)
The hip injury is only part of his medical history, and a team thinking that they'll have him play in 2020 is foolish. The best situation for him would be rehabbing and learning for a year, maybe starting on IR like Drew Lock was able to do for the Donkeys this year.
Tannehill sure looks like a decent QB, even unseating Mariota. I'm guessing that this angst is part of what leads some of you to be so infatuated with Tua; you just want that franchise QB. I agree with those of you who are ok getting him at 5, but not trading up. If you can't mentor the guy, he may be a bust, anyway.