If I'm Roy Williams, I don't think there's any scenario in which I let Ty Lawson play Radford on Thursday. Radford isn't a world-beater with ball pressure, and Bobby Frasor is more than capable of running the point for this game. The risk-reward factor is not in the 'Heels favour here, as there is the risk that Lawson could aggrevate the injury in a game in which the 'Heels should easily roll.
I'm not trying to detract from Radford's body of work or suggest that they are a terrible team, but North Carolina has little to worry about in this game with or without Lawson. The only people concerned about Lawson's toe as it pertains to impact on the Radford game are those in the gambling community. How will the line change with Lawson out? Is it worth the risk to take Radford if the line drops significantly? These are the questions being asked, not can UNC beat Radford without Ty Lawson?
As a Raider fan I'll tell you, watching an explosive player labour with a toe injury is very frustrating, and the more rest Lawson can get in before games that should challenge the 'Heels a little more, the better. If Lawson does play, it will be the most head-scratching decision I've seen in some time, and one that could cost the 'Heels in a large way further down the road. Bottom line: rest him up until you need him. Don't look past Radford, but know that you can handle them without Lawson.