If you were able to emotionally detach yourself from this topic, then you'd have no problem accepting the fact that this championship (and the Sox 2004 and 2007 championships) are delegitimized. A legitimate champion is the true champion, and to me, when you are talking about sporting competition, that means an equal playing field, which is not only the field of play but the ability to acquire the players that take the field. Therefore, when teams that benefit from an easier route to player acquisition win, they did so on a uneven playing field, and they are not the true champion. The legitimacy of their win has been reduced, because they accomplished it through means unavailable to all of their competitors.
For some reason you are mistaking my use of delegitimization with illegitimate. I'm not saying it is completely devoid of legitimacy. I realize there is some accomplishment in winning despite the advantage. I'm saying the legitimacy is not 100%. The dictionary defines delegitimization as the act of removing all legitimacy, but that's because there is no half truth, something is not partially genuine. It's all or nothing, so I took some liberty with the word since in many cases the prefix de- means a reduction of.