As you surely know by now, the Giants ended the respective tenures of Ben McAdoo and Jerry Reese on Monday. Now it’s time for them to restart the tenure of Eli Manning as their starting quarterback. Effective immediately. The Giants cannot undo all of the mess they created in taking for granted Manning’s 14 years of impeccable service to the franchise. They cannot restart Manning’s 210-game starting streak (the second-longest by a quarterback in NFL history) they unceremoniously ended Sunday with his benching. It’s unknown whether the damage the Giants have done to their relationship with Manning is irreparable. Only Manning and those in his inner circle would know that for sure. If this hasn’t already taken place, Steve Spagnuolo’s first act as interim head coach must be to tell Manning he’ll be the starting quarterback when the Giants play the Cowboys on Sunday. There were reports soon after the Giants fired their coach and general manager that Spagnuolo is going to start Manning. Manning, on his weekly WFAN radio spot Monday, did not confirm that to be the case, but he did say, “I hope I’m the starting quarterback. I went in [Monday]. I did speak with coach Spags with a little bit. Obviously, it had only been 30 minutes since he had probably been told he’s head coach. But I told him I want to be the starting quarterback, I want to be out there and help us win these four games.” If Spagnuolo, a former head coach of the Rams who’s very popular inside the Giants locker room, has designs on using these final four games as his interview for the head coaching job, then he must start Manning.