Loma hasn't ducked anyone. Stop the BS. Right now he is focused on getting back to Lopez and unifying at 135.
Stevenson really wants Valdez, but Bob Arum has come out and said, Valdez will fight Emanuel Navarrete instead. He said he's going to push for Stevenson v Loma. That fight would be a great chess match.
The guys that Loma currently wants to fight the most are Teofimo Lopez and Tank Davis. Shakur needs, at least, unify the belt in 130 and beat some names first before challenging Loma.