The term getting open is too vague.
Today Colston would shake the CB at the LOS, be free for a second and the ball was delivered by Brees, easy first down. On Sunday afternoom Rodgers was delivering a pass to Driver, Driver had yet to break his route on a comeback.
Are the WRs getting open? At some point I would say they are, the QBs have to have the anticipation skills to notice them.