Your evaluation is so one-dimensional it's not even funny. It's like looking at a scratch drawing on paper of a box compared to looking at an actual box. Oh wait, there are 4 sides, and space inside. Now you're talking 3 dimensional.
You look at one dimension - in this case frame/height/weight, and you put all your eggs into that one basket. Dude, Jimmy G can't stay healthy to save his life. He is 6' 2" and 225 (roughly). So, according to your one-dimensional analysis, the guy should be healthy as an ox.
Daunte Culpepper, Chris Chandler, Robert Griffin III, Jay Cutler...hell the list goes on. All larger-framed guys had constant injury concerns.
Your highly flawed analysis doesn't account for current rules that are damn near flag football concerning QB play, nor the fact that Bryce feels the rush and pressure and has an innate sense to avoid the rush or at least the big hits, that he's not a run first guy and only looks to run when the play breaks down. He understands how (for the most part) to avoid heavy contact. Kyler Murray doesn't have those intangibles yet. Maybe he'll learn them who knows - but Bryce does.
Physically, these two are the closest match, but they don't play the same, thus you cannot make a direct beeline from point A to point B. There are no health guarantees with any player drafted. Hell, I thought Will Fuller was a great pick and he was healthy in college, and he simply could not stay on the field as a pro. It happens - but it's not because Will was Wee little Willie. He had plenty of size. Some guys just don't stay healthy as pointed out with Jimmy, Jay, Daunte, et al.
You're definitely entitled to your opinion, but when the Texans essentially agree with me and take Bryce, there's no crying in your soup! Get on the love train like the O'Jay's and let's roll!