This is a guy that makes a lot of sense at 27. If you are going to take an OL in round 1, then he at least needs to be on your game day roster in his first year. Since Dallas normally only carries 7 OL's on game day, versatility is key for your backups. Versatility is a strength of Saffold, who has the capability to play OT or OG. Since he can also play LT, he gives you another option should Free falter. In the long-term, he is also a viable starter either as an OG or OT.
As for Saffold being a reach at 27, Gosselin has him rated at #30 in his top 100. So he represents decent value for a late first round selection. I wouldn't mind him at 27 at all, assuming Iupati and Pouncy are off the board at that point.