I think Jenkins could sneak in for US's 4th or 5th man, he's had a great fall and winter...several people like Jager, Mead et al have better pr's, but Jenkins seems suited for XC (and also like he could slash some time of his pr's in a time trial to be close to on par with them).
The US doesn't have much of a shot though. With World's only scoring top 4, a lot of east Africans have to have bad days for the US to get more than Rupp into single digits.