Looking for positive signs from the Titans’ offense as the preseason games start? Several have emerged. QB Vince Young’s strong play in a scrimmage vs. the Rams was a pleasant surprise, the way we hear it, after a nondescript start to training camp. The Titans want a less mistake-prone, more accurate Young, and his command vs. the Rams was impressive. The offense also received a boost from the return of WR Roydell Williams, who still is bothered by an ankle injury suffered at the end of last season but capable all the same of being a vertical threat for an offense that needs all the field-stretching capability it can get. Along those same lines, the continued improvement of speedy rookie RB Chris Johnson remains one of the top story lines to watch throughout the preseason, the way we hear it, and the potential exists for him to be a significant part of the offense.