User blog comment:Eobard95/Flash 5x08 - Thawne and Zoom plotholes/@comment-9346948-20181209231434/@comment-26624146-20181210144617

Because the Time Wraiths were hunting Zoom for violating the timeline years before he met Barry, the only reason he finally did get caught by them was because of Barry, so I don't see why they wouldn't capture him sooner if they had the chance.