Finding top talent in FA generally requires a lot of luck, period. Teams rarely let top talent hit the market. It's gotta be a cap strapped team or a team lucky to have great depth at a particular position group, or some other type of extenuating circumstance like the guy being at or near the poojt where hes likely to start declining. Especially at premium positions. Top tier QBs, OTs, ege rushers, CBs, etc. rarely hit open free agency in their prime.