here is what I call "discrepancy" in your story:
- the results of first 2 years of undergrad show nothing else but a lazy and procrastinating character,
- the easiness with wich you describe that "a couple of profs took you under their wings" shows more that "Mama and Papa bear" were interested in you doing the research (and somehow they got you into this, wouldn't specify how...leave space for immagination), bc it's no way that someone would offer you, a student with 1,6 GPA, a research opportunity just like that, because of your amazing eyes/smile/both - here you need some contacts
- your experience at Stanford would have the same interpretation as your third year research experience and the Professors' wings stuff,
- one question? if you wasn't interested in Medicine from the beginning, why to volunteer then at Sickkids (fanciness for your CV ?), and it's no way that a single random situation in your life (the man in pool of blood, as you say) motivated you to do medicine; with the same success you could have been motivated to become a policeman (thre was one at the scene, wasn't it) with a certificate in CPR, so in case you get in the same situation you would know what to do, right
good luck, I belive you are in medicine, you have all this experience, but NOT in the way you putted it here, sorry, but good luck