Lowery did a very good job with the Colts in 2015 as the team's starting safety, as he started all 16 games and recorded 76 tackles, a sack, eight passes defensed, and four interceptions (returning one for a touchdown). He did a good job in coverage and was able to help in the run game, helping to ease the concerns many fans had about the safety position. The year before signing with the Colts, Lowery played in 16 games for the Atlanta Falcons in 2014 and started 15 of them, playing well.
With Lowery now gone, the focus turns to Clayton Geathers at safety for the Colts alongside Mike Adams. If it had been up to me, I would have re-signed Lowery to compete with Geathers, but the fact that he got a three-year deal from San Diego means they had more confidence in him, and that's good for him. He has done a fine job in recent years and was once again reliable for the Colts in 2015, so the Chargers got a good player. For the Colts, then, Geathers is now the focus, unless the team spends a high draft pick on a safety. They like Geathers a lot and he saw some action last year, so he could see a much bigger role in 2016.