We all knew the one injury was Orton's fault. How about all the others? How about his suspensions?
I can't recall the order of the injuries, but according to the RF shoot (where Kennedy tells the full stories himself), here's how it went down (paraphrased):
1) The shoulder popping out of its socket was NOT caused by Randy Orton, rather it was in a match against Shelton Benjamin that it happened. They had agreed on the roll-up finish before the match because the ending during the previous house show had sort of bombed:
Benjamin was on the top rope and Kennedy went after him - Benjamin knocks Kennedy down, so that Kennedy bumps his head on the turnbuckle, then Benjamin leaps down and hits Paydirt and 1-2-3. The turnbuckle bump got a bigger pop that Benjamin's finisher, which is why they wanted to change it up to a roll-up, so that the "bigger pop" move was the finish. However, for whatever reason, Benjamin decided to hit Kennedy with Paydirt and doing it stiffly (grabbing Kennedy hard around the neck, in case Kennedy would try to no-sell it), thus causing Kennedy's arm to get stuck between their bodies and Kennedy went down hard (not flattened out), twisting his shoulder out of the socket.
2) Another injury was when he tore a muscle in his side from a bump during the tour of Europe. This was in a 6-man tag in Italy:
What was supposed to happen was that Paul London was supposed to give him a forearm to drop him off the apron, so Kennedy keeps his grip on the top rope loose, to sell the punch more easily. Instead of delivering the forearm, though, London dropkicked (dropsaulted?) Kennedy from very close range, effectively leg-pressing him way the hell off the apron, clean over the mattresses by ringside and into the guard rail. To make matters worse, Kennedy didn't land flat on his back, but twisted to the side, which in all probability is why he tore his muscle.
3) The injury when he dropped the MITB briefcase to Edge. According to Kennedy, HE was the one that was supposed to fill the role that Edge had in the Batista vs Undertaker cage match, where Edge cashed in at the end, speared Taker and pinned him for the gold. This was nixed and Kennedy and Edge went into a match for his MITB briefcase on the premise of "I don't want to put my briefcase on the line." -- "Chicken!" -- "No one calls me a chicken!":
Batista and Kennedy were in a house show match and since they knew each other so well by this time (they had worked many matches up to this point), they didn't necessarily call out all the spots. However, Kennedy was supposed to be launched shoulder-first into the post, but he was selling it for Batista (i.e. running into the turnbuckle himself) so all Batista had to do was pantomime it. Instead, Batista throws Kennedy into the turnbuckle full force (and Dave's a strong guy), where he takes a bad bump and rolls out onto the floor.
After this injury, he worked taped-up and only got an MRI after several more matches. The doc then diagnosed him with a very bad tear (clean off the bone) and he had to drop the briefcase. A few weeks later, Kennedy wanted a second opinion, so he went to another doctor, who performed another MRI and concluded that Kennedy was nowhere near as injured as the first doctor had thought.
4) His suspension. He did not originally make his semi-controversial statements in any interview - he posted them on his homepage/blog, while plastered, at 3 am in the morning. This made him a target for mainstream media and news outlets, where he couldn't really back down from the line and tone he held in his original post.
He has since admitted to using roids during that time and claiming that it was wrong for him to say that he didn't, but he retains that "anyone using roids would of course say they didn't". Yes, he realizes why people would think it is hypocritical to do so, but he doesn't want to linger on it. Let bygones be bygones and all that
5) His firing. We could all see how it happened during the incredibly lame Celtics vs Lakers 10-man tag gimmick match. Orton was supposed to take a belly-to-back suplex and jumped way too high, so Kennedy had a split second to decide whether to flip Orton over or pull him back in. Kennedy pulled him back in and Orton landed FLAT ON HIS BACK, where his head never touched the canvas. Nevertheless, Orton went on a tirade backstage on how Kennedy was unsafe in the ring, icing up his neck and complaining like a bitch about it, etc.
Later that evening, they spoke again and Orton apologized for over-reacting and said it was all water under the bridge for him - Kennedy cracks a joke and Orton goes off on a tirade about "See? This is what I'm talking about! You never take shit serious!" The next day, Kennedy was released.
6) The hurting of John Cena. According to Ken himself, he is still trying how to figure out how selling an armdrag can possibly injure someone. Cena tore a muscle because Cena stumbled and semi-botched it. The Cena threw a hissy-fit in the locker room about it.
7) The hurting of Bobby Lashley... was a work.