Using yards per touch is absolutely silly for so many reasons, but I'll limit that rant to this: YPR is extremely variable for RBs* and you're working with a tiny sample size.
It would be much better to split it out to YPC and YPR and estimate carries and receptions. In the last 8 games, Dixon had 73 carries @ 4.9 ypc and 25 receptions @ 6.2 ypr. West had 82 carries @ 4.0 ypc and 23 rec @ 7.4 ypr. To me, there's a vast difference between 4.9 ypc and 4.0. 4.9 is elite while 4.0 is JAG territory. The sample size leaves something to be desired on Dixon's end (I think I read that it takes 400 carries for a trend to develop), but given that West has a career 3.9 ypc over 425 carries, I think we know who he is. At least with Dixon, there's hope.
*Take Mark Ingram for example, his YPR in the past 3 years has been 5.0, 8.1, and 6.9. That was my first player to check. My second was Adrian Peterson - even crazier numbers. In his record breaking year, he had a higher YPC (6.0) than YPR (5.4) and it wasn't a small sample - he actually had 40 receptions that year. During the lowest YPC of his career (4.4) he had his highest YPR (10.1) on 43 receptions.