Okay, this is not gonna be as technical as my other posts... partly because I haven't been watching crazy Danny Garcia videos, and second, because these ideas are more hunches than technical breakdowns.
First, Garcia is a rugged guy who can be smart and can fight rough. He's determined, tough to hurt, and keeps coming at you. He's beaten quality opposition in Kendall Holt (and oh yeah, Morales). He admits he's always learning which means he's gonna be improved on this fight and will fight smart and will find a way to weather and beat Khan's speed and athleticism.
Second, Khan's best victories have been agst limited opponents: guys who can punch but can't box (Maidana), small guys (Barrera), guys who can box but can't punch (Malignaggi), old guys (Barrera, Judah), or guys with no heart (Judah). Once we put in front of him someone who is smart, can box and adjust (Peterson), someone who can pressure him and make him fight dumb (Maidana, Peterson) then Khan's dumbness, pride (glove claps), and willingness to run/fight toe-to-toe will get the better of him, and all that height, reach, power, speed, and athleticism gets nullified by wasted running, shoe shining, putting his chin out there to get hit, and going to toe-to-toe.
I think Danny Garcia will bring this out of him, and I think Peterson showed that Khan is not yet elite. Like Ortiz, Khan has all the physical abilities and then some to be elite, but as Cotto has shown, a huge part of that process is mental, and some people have it, and some people don't. They are like Wizard of Oz characters, which one is missing a heart, and which is missing a brain? Is it Tin Man and Lion, or is it Scarecrow and Lion? I dunno. Have a nice day! I'm going all in on this one, but it's mainly due to Khan's weaknesses and Garcia's class/toughness. Pc!