Cochise Team boot for my 12 year old??

Looking at boots for my 12 year old, want something with a walk mode since he's starting to tour a bit. He's a pretty big kid, about 5'4 110-15 pounds, advanced skier but not total ripper. Big feet, size 26 boots. Have found some decent deals on unused Tecnica Cochise Teams from last year. Its still a junior boot (he'd be in the biggest size) so it has a somewhat lower cuff and lower flex of 90 compared to many adult walk mode boots of that size. Does that sound appropriate, or should I just be looking for some 100 flex adult walk mode boot? I'm super geeky about my own boots, but no super knowledgable about whats right for kids stuff... Thanks

never mind, I pulled the trigger and bought them...