We've had guys stay for their senior years unexpectedly before including this year. There are a few Clemson got back that are real head scratchers because they were probably the first player taken at their position. When Barron and Hightower came back, they were hoping to solidify a shakier draft slot in their position groups (each had injuries that were going to affect their Pro Day/combine). When Allen came back, he was trying to avoid a deep year for the DL in the draft that was likely to drop him into the 2nd or 3rd round. I don't get why Clemson's Wilikins came back though because he was very likely the first interior linemen off the board.
I don't have any reason to expect that Dabo is advising his players poorly but I hope he's looking out for his guys. I know Saban would just about bar a kid from entering the facilities again with Wilikins draft stock.