Secondly, I cannot believe that Gruber would state that Apples quarterly report has more importance than a day that remembers a remarkable man. I think Martin Luther King JR day is pretty damn important one. But that`s just me, and my opinion.
"The announcement of his leave was perfectly timed: on a weekday, but a holiday on which the U.S. stock market is closed
More important than the holiday, though, is that Apple announces its quarterly results tomorrow, and they’re expected to be excellent"
See, "more important than the holiday" is referencing Apple's strategy of announcing Jobs' leave on MLK day. Gruber is comparing two things that affect Apple's stock price--announcing on MLK day to avoid a panic, and announcing a day before Apple's Quarterly earnings report, and concluding that the latter tactic is more significant.