What I meant in my final sentence was that Anakin & Obi-Wan both managed to lose blue sabers, again underscoring CC's point that blue blades just don't cut it (pardon the pun). Add to this that their loaners were one blue and one green, as CC points out. The blue one didn't get the job done. Yoda's green one eventually did.
Man, this thread is a testament to the level of detail some of us study in the movies. I doubt this was purposeful in Lucas' mind because he has such a lack of attention to story detail, but it's the kind of observation that could one day make nice fan fiction.