Im confused as to the points cost calculation of the Drukhari Battleships in particular.

Like the Dying sun seems to be literally the same ship as the Falling moon, except it doesnt have the Torpedoes. Yet it costs more points ?

The Iron Thorn is 122 points higher cost than the Falling Moon since it replaces the Torpedoes with a launch bay. With the use launch bays can have i can somewhat understand that.

The Obsidion Rose has straight up 3 more weapons than the Dying sun, yet only costs 18 points more. It seems weird to me.