RS has stated he likes what he's seen from Whitley in off-season conditiong (hopefully losing some of that jelly roll stomach). Whitley is strong as a bull, he doesn't have the quickest feet ever though and needs technique to survive. He is learning that and I feel he'll surprise this year. I'm not worried about RG as we have many to put in their and perform at/above last year's level.
A WR, RT, LB, DT, S all are possibilities to me. I really think RS knows what he's doing. He's been around football his whole life, has seen it from a player's persepctive (his brother is a former All-Pro) and from managements side.
He has also seen things from management but not quite the top, he's seen the mistakes of others, the successes of others, and is a person known for quantitative data that he loves to analyze. I trust him and think he'll come through one or another will a solid plan, without a knee jerk reaction to what fans, or others, want him to do.