Godfrey is on IR, Mikell was injured week 2 (ankle, gotta be HAS, still not practicing after 3 weeks, ruled out week 5). So Lester is starting again at SS this week. Played well in week 3. Unclear if Mikell will get the job back or not. He was signed off the street just prior to week 1, but has much more experience than Lester, an undrafted rookie out of Alabama.
If you need an SS for a week, maybe two, go for it. But know the front seven will eat up most of the tackles, and whether he sticks or not is highly dependent on his play.