ALAMEDA (AP) — After failing to hear his name called during last spring’s NFL draft, Denver Kirkland’s number is getting called quite often for the Oakland Raiders this season. Kirkland has gone from the disappointment of being undrafted despite leaving Arkansas early to making the Raiders initially as a practice squad player to becoming a key contributor as Oakland’s extra offensive lineman. Kirkland played nearly half the offensive snaps against Denver on Nov. 6 as the sixth lineman for the Raiders (7-2), with each entry onto the field accompanied by the announcement by the referee that No.