He generally was percieved to have a 5th round grade, and went in the mid 7th...so yeah, decent enough value. It was entirely reasonable though for his "Co-DPOY" to go in the top 20 as opposed to Sam going in the 7th.
Mosley had two consistent seasons as a MLB with over 100 tackles. His stats were also pretty consistent game in, game out. He was also a freshman all american, two time concensus all american, 2 time SEC first team, a Butkus award winner (best LB in NCAA), and a multi-time national champion. Mosley's measurables were pretty good for a MLB, both in terms of physical stature (height and weight prototypical for the position) and combine (like his 4.4 on his 40 time)
Sam's only year over 5 sacks as a pash rusher was his senior year. Additionally, 9 of his 11.5 sacks came in a 4 game stretch. In 8 games he didn't register a single sack. This was the only year he was any kind of first team/all american type player. His measurables were relatively poor, coming in a bit under sized for DE but not quick enough for rush OLB.
I'm not implying that you've suggested otherwise, but I didn't want some people to read that and take away the notion that somehow it was wrong that Sam went in the 7th and the SEC Co-DPOY went in the top 20. Sam in the 7th was decent value (one of MULTIPLE potential value picks, as is the case in every draft), but also likely relatively where he belonged if he was going to be drafted.