Here is all you need to know about the state of these 2013 Yankees: Remember the team captain? The guy who turns 39 in June and faces over a century of data that players his age shouldn’t be patrolling shortstop anymore? And who is trying to return from a serious left ankle injury and hasn’t participated in a Grapefruit League game? “I’m not worried about Derek Jeter at all,” Brian Cashman said yesterday at Steinbrenner Field. “He’ll be ready when it counts. I’m not worried about Derek. He’s the least of our concerns.” That should sound like crazy talk by the Yankees’ wheelchair-bound general manager. Instead, given what else has transpired in this camp, it’s perfectly understandable. The latest news is that Mark Teixeira will be out for 8-to-10 weeks, having strained the ECU tendon in his right wrist, and the immediate conclusion couldn’t be simpler: The Yankees are more vulnerable than they ever have been since Jeter joined them. Just look at their worst-case scenario Opening Day lineup, without Jeter, posted here. Good Lord. The Yankees look health-challenged, depth-challenged and talent-challenged. They play in a division, the American League East, in which no entry will be a walkover, while the AL West’s newcomers, the Astros, will serve up easy days at the office to the Angels, A’s and Rangers — making it harder for the AL East clubs to gain wild-card berths.