The Seahawks on Saturday signed tight end Tyrone Swoopes to the team’s 53-man active roster off the practice squad to add depth at a tight end spot battling injuries heading into Sunday’s win-or-else game against Arizona, making room by placing defensive tackle Nazair Jones on Injured Reserve. Jones has missed the last four games with a high ankle sprain, with coach Pete Carroll saying he recently suffered a setback. Going on IR means Jones would not be eligible for the playoffs if Seattle gets there, with the team obviously thinking he wouldn’t be recovered in time. Swoopes gives Seattle four tight ends on its active roster. But two were listed as questionable on Friday — Luke Willson with a sprained ankle suffered this week in practice and Nick Vannett with a back injury. Vannett was a late addition to the injury report, added after Seattle’s practice on Friday, so there was no word from coach Pete Carroll on the severity of Vannett’s issue.