I don't think there is any shot of him actually getting an offer from a team in the top 5-10 but if it was there I think you'd have to very seriously take a look at it and possibly let him go and take that pick from the team offering.
Why wouldn't they just take there chances of having McFadden fall to them if they wanted a RB so badly? Worse case scenario, they wind up with one of the other two- and doing so possibly via a slight trade down. Barber to a top 15 drafting team makes little to no sense whatsoever unless they really REALLY like Barber over the top 3 coming out this year.