lol, I don't know what you want me to tell you. I don't make the formulas. Clearly the #4 album and #24 single (which had good recurrent airplay and sales well past January, but ok), a huge tour (though half its gross was outside the US anyway), and all the other factors BB counts
together put them at #1. It's not like
anyone sold 5m this year, so I'm not sure what you're complaining about.
I assume Justin Timberlake is #5 mostly on the back of his huge tour. Iggy is #6 based just on singles since we know album sales and touring aren't doing much for her. You could nitpick the chart all day long based on perceived "dominance," but that doesn't change how the numbers crunch.
edit: I just remembered you once tried to convince me the Jonas Brothers were bigger at their peak, I shouldn't even bother