I would think that if it hadn't happened, Trayvon would probably refute it.
The silence either means he didn't notice the cousin's comment, or that he saw it, had done it, and decided it would be better to discuss such things where there was no record of it. This is consistent with him not being caught by any sort of officials doing it. Why create a twitter trail that could prove him guilty later? If currently the bus driver had no idea who he was, etc... we know he had no way of consistently, reliably getting around Sanford and lived in Miami Gardens. We know he had like two relatives of similar age to him, plus Chad Green, living in Sanford.
So, if he was riding a Sanford public transit bus around, for instance, and ended up punching the bus driver as a random act of unprovoked violence, or because he perceived attitude from the driver, or because he had no money to pay the fare like this young man:
http://www.youtube.com/watch?v=t9mBTwu1h_4 (also 17 at the time this took place)
regardless of why it ended up happening, if he told someone, or one of his relatives in Sanford was with him (I believe there were two different cousins, and then of course Chad) and relayed this to someone else, who then relayed it to the cousin on twitter, this is exactly the sort of response you'd expect.
It may even be possible that Trayvon felt he'd ruined the bus system in Sanford for himself, at least temporarily, and was afraid to try to ride again for fear of being identified by the bus drivers. This may be why he was walking around, or maybe it was just because 7/11 didn't strike him as far enough away to merit the bus... but maybe he was frustrated by ruining the bus option for himself, not having a car, being suspended, and now some bitch ass cracker is dogging him? Sheeeeit, maybe GZ's attention was the last straw.
Oh and keep in mind that as a bus driver in certain areas you get so used to certain types of horse shit (I used to be one) that if the driver didn't sustain serious injury... and if Trayvon was similarly hoodied up at that time, or just unremarkable looking enough... the driver might not even bother to report it, even to their own boss let alone the police. A lot of that sort of thing happens.
"Some punk kid threw a punch at me, my neck/shoulder/arm/jaw hurts but nothing was broken... do I really want to hassle with the paperwork? They'll never find this kid. He looks like a bunch of these kids who cause trouble on my bus... fuck it"
Now imagine you're that bus driver and you work long hours and you pay passing attention to this case at most, what pictures are you seeing when you do catch a story about it? 12 or 14 year old Trayvon. 10 year old Trayvon in his peewee football uniform. Are you going to fucking say "that's the guy" ? Fuck no. He doesn't look like that anymore, a person changes a lot in appearance when they hit that teen growth spurt, and I'd say Trayvon had hit it hard. The only thing he might recognize would be the 7-11 video. What percentage of casual observers have seen that? Seen it in any kind of decent quality? Seen the side angle view where you can see Trayvon in profile instead of bird's eye view? Seen it for more than a flash of a second?
A lot of things would need to come together for that bus driver to even POSSIBLY recognize him. Hell, even if it was a big to do around the bus station at that time, and they had print out security pictures from the bus's camera of him, whether it be Sanford buses or Miami Gardens buses... either way, the odds are strongly AGAINST anyone who was aware of it at that time, among the drivers, management at the bus company, police who took a report, actually connecting the dots and figuring out it's Trayvon.
Because again, the family was expert in which pictures they provided. The media has also basically ignored the bus driver tidbit entirely. What percentage of casual observers have seen the recent (gold grill, finger flipping, standing next to Deedee at school) pictures? It's hovering around 0%.
The average person, 99.999999% of people who pay attention to this case, in any way, in passing or whatever, have never heard about the bus driver thing. And have never seen the 7/11 tape. Especially the profile view.
as to the bolded...