The difference is, Ashton still had time left on his contract, where-as the other two players did not, their contracts ran out this summer.
Ashton has failed to ever really make an impression under Brian Little, managing only a handfull of selections in the first 16.
Ashton is expected to join Shrewsbury Town where he spent five months on-loan this season, impressing the Shrewsbury staff and fans alot. This begs the question, why didn't Rovers try and get some money for the youngster?