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This battle seems obvious at first. Blidi Wreh-Wilson was considered a steal when the Titans drafted, while Coty Sensabaugh did little his rookie year.
However, keep in mind that Sensabaugh was drafted as a developmental prospect, and he showed flashes of tremendous talent. In the preseason game against the Saints, he had seven total tackles (six of them solo) and a defended pass.
In the regular season, he only had 31 tackles and three defended passes, but 22 of those tackles and all three defended passes came in the last seven games of the season, so he showed some improvement, and could be much better by the beginning of the season.
Wreh-Wilson, on the other hand, has a career eight interceptions and 27 defended passes in college, not to mention his great height for a corner (6'1") and speed that's almost as good as Sensabaugh's.
If Sensabaugh has improved his technique in the offseason, this battle will be neck and neck, but if he hasn't, Wreh-Wilson will win out easily.