Good point - he is the kind of player Ferguson wouldn't have signed. I remember he wrote in his biography - the first thing he did when looking at a player to sign was to check how many matches a player had missed through injuries.
The first 10 or so players he signed - the likes of Bruce, Donaghy, Anderson, Leighton, McClair, Hughes, Phelan, Webb, Pallister, Ince and Wallace - none of these players had an injury-history before joining United. Players like Donaghy, Bruce, or Anderson had barely lost a match through injuries in their career. Donaghy lost something like 6 league games in 9 years, while the least amount of league games Bruce had played in a season before joining us was 39 (out of 46) for Gillingham
So maybe Scott would be too risky to sign right now