There are a couple of hurdles the Giants are going to need to negotiate if they hope to survive their Thanksgiving Day pilgrimage to Jerry’s World . You can start with the Cowboys themselves, of course, since Dallas has already beaten the Giants once this year, in Week 3, and is coming off an extraordinary annihilation of one of the NFC’s best teams, the Vikings. Depletion is another. The Giants’ already-Iggy-Pop-thin receiving corps is banking on a next-man-up hero, and is on the verge of having to call up either Amani Toomer, Homer Jones or Stephen Baker the Touchdown Maker just to field the standard 11 on every play. The offensive line is dinged up. The secondary is looking more tertiary by the day.