The Pathways program worked pretty well for the first twenty or thirty pilots who went through the program. It is seniority-based, it is NOT a flow-through, and the company has recently increased the amount of PIC and Part 121 time required to move on to Alaska. As Snacky indicated, you'll probably be spending at least five years at Horizon before you can get on with Alaska.
For this reason, many of the Pathways pilots view it as a backup plan. it''s ironic that many of our former pilots are now working for Delta.