that's what's so risky about trading away Julius, 1st off, we might not get an equal player, or better, and 2, if MBIII has to move back to 3rd down/goalline, we're w/o Julius and w/ a lesser runner in that starter's role, and of course you can't have it that way, so you move MBIII to a role he's not best-suited for, and your running game suffers
make the starter's role a gamble when you have 3 options for that starter's role, hell, even 4, still have Tyson Thompson to throw into that mix, and that can be best done by taking a runner on the 2nd day IMO
fill more pressing needs 1st, and then play around w/ the RB situation