Four Colts players who didn’t participate in Wednesday’s practiced returned as full participants on Thursday. The Indianapolis Colts had a rather hefty injury report to start Week 4, as six starters sat out of Wednesday’s practice. However, four of them returned on Thursday, giving the team an improved outlook on their health for Sunday’s matchup with the Tennessee Titans. Here is how the Colts and Titans are looking before this weekend’s matchup. COLTS WEDNESDAY Did Not Participate — S Julian Blackmon (ankle), DT DeForest Buckner (elbow), CB Stephon Gilmore (hamstring), C Ryan Kelly (knee), DE Yannick Ngakoue (back), RB Jonathan…