"Is it just me, or does Weaver's delivery leave anyone scared about arm troubles?"
It's a risk with anybody, some guys have more rubbery arms than others, but there's no way of knowing that for years, though its a good sign his brother hasn't been injury plagued...
The one good thing I see is, he's not overly reliant on his breaking stuff, and it's the breaking stuff that really overtaxes the arm, that and pitching past your fatigue point.
In terms his mechanics, he's nothing like Greg Maddux, but he does remind me of Maddux in the pitches that he throws (mostly moving fastballs that vary in speed) and how he hits his spots and doesn't throw anything down the middle. Weaver has a bit more giddy up on his fastballs though.
It's that not throwing fat pitches over the plate that's the most impressive thing. Sometimes a Thome or a Manny is gonna hurt you no matter what you throw, but it's walks and the fat pitches that a bum jack that usually kill you.