Taylor has simply not been able to find consistent fantasy-relevancy after Marlon Mack's injury. The Colts prefer to rotate Taylor, Nyheim Hines, and Jordan Wilkins, and it's unclear which, if any, will succeed in any given week. Roster Taylor, but it's impossible to start him unless things change soon.
Hines went from being heavily involved in Week 1 to playing 12% of the snaps and totaling just one touch in Week 2. His value lies somewhere in between, so try to hold him on your roster if you can, particularly in PPR formats.