User blog comment:ZeVikingSif/Could it be that Yao Fei is Prometheus?/@comment-807326-20170203024242/@comment-4952704-20170203030404

The Sara thing was just one example. We just now learned that Talia has been keeping her eyes on Oliver, meaning she more than likely went to the island herself and that could also mean the League were with her.

I think the main point emphasised is that Prometheus has a connection from the very beginning. It could mean that he's connected even before Season 1 begins.