Robertson signed as an undrafted rookie this spring after playing at North Texas and SMU. Arizona credits him with 14 sacks in 52 collegiate games. He could make his NFL debut Sunday, but the elevation alone does not establish a place in the defensive rotation or a snap count.
If Sweat cannot play, Urban identified Eku Leota as a candidate for more playing time alongside Jordan Burch, Baron Browning and Zaven Collins. Burch is the only player in that outside-linebacker group with a sack this season, according to the team report. The move adds depth while Arizona tries to improve its pressure from the edge.
Cards Wire's Jess Root reported that Robertson would leave Arizona with five available outside linebackers if Sweat sits, matching the number the Cardinals have used in their first three games. Root also noted that Sweat had no sacks or quarterback hits through those games. Those results do not settle Sunday's lineup: Sweat's official questionable designation remains the controlling status until a further team announcement or the inactive list.
For roster decisions, the distinction is straightforward. Robertson has a temporary game roster place. Sweat's availability remains unresolved. Arizona has protected itself against an absence without announcing one.