I agree, Josh is the better runner, probably the better overall athlete, but not by much if so. Kelly actually ran the ball pretty well last year without the benefit of a decent running game at all. Here are the running numbers compared.....
Dobbs- 146 carries, 671 yds, 4.6 avg, 11 tds
Kelly- 106 carries, 509 yds, 4.8 avg, 10 tds
And like you said, Kelly's by far the better passer. I'll not include the passing numbers out of respect for Dobbs.
Nb4 D4H says Kelly is a system QB who's only successful because of the offense he runs.