In a surprise, Seattle deactivated cornerback Sidney Jones, further depleting a secondary group already down two other veteran defenders heading into Sunday’s matchup with Atlanta. When the Seahawks hit the field against the Falcons on Sunday, they will be doing so with razor-thin depth in the secondary. One of three cornerbacks who won’t suit up today at Lumen Field, Seattle surprisingly deactivated veteran Sidney Jones, who was not on the injury report this week and did not receive an injury designation on Friday. While he wasn’t expected to start, his absence as a healthy scratch creates a substantial problem if…