Eric Young (33%)
In terms of producing fantasy value, Eric Young is the definition of a one category player. In 2013, he led the national league in stolen bases while producing negligible value in any other offensive category. If your desperate for the stolen bases consider him but even with value in one category, there's better options out there.
Through age 28, his most similar player is Adrian Brown. From age 29 on, he played 39 games. If anything else, Young at least looks on track to receive regular playing time. With a career 76 OPS+ the question is how much longer can he find regular playing time with sub-par offense paired with sub-replacement level defense.
Dee Gordon (28%)
During his career, Gordon has displayed impressive speed and able to pick up some stolen bases when he was in the starting lineup. The same can't be said about his offense (72 OPS+). If your picking him up, the two things you would also be banking on is some modest improvement offensively and that he will hit well enough to keep himself in the starting lineup.
His most similar player through age 25 is Pat Meares. After turning 25, he did log seven more years in the majors. While he did show some pop in his bat with a few double figure home run seasons, he never had an OPS+ above 100.
Grady Sizemore (24%)
Sizemore is back after missing a couple seasons, winning a spot on the Red Sox roster. From 2005-2008 he would be a must-have with a nice balance of average/obp, power and speed. The question remains is how much of that form is still there?
All numbers, comparisons, etc. found on baseball-reference.com