These are good stats, but you left out how many games played and how many total carries. B-Jax played only sparingly in his first two full actual playing years. Helu has been seeing significant PT ever since 2008. B-Jax really only got a lot of touches in one year.3 year total for Brandon Jackson = 1431 rushing yards (4.9 ypc) and 313 receiving yards
3 year total(not including SR. year) for Marlon Lucky = 1910 rushing yards (4.9 ypc) and 1091 receiving yards
3 year total for Roy Helu JR = 2159 rushing yards (5.5 ypc) and 455 receiving yards
What does this all mean? Who knows but if you base opinions on solely the stats alone B-Jax is way behind.
Again, not saying finding those stats changes much. I'm just pointing out that B-Jax played significantly less than Helu.