Most of these brand decisions were made well before 2010, if not 3 or more years ago... how does the fact that they were big as businesses in 2010 make them "Color Trends" for 2010? Google was really big in 2010 too, does that mean "rainbow" was a trend?
They were standout brands that either made a big impact, or were "hot." A lot of design is just "inspired" from other design, so hot companies in 2010 have an impact on the trends.