This was to let his ‘rescuers’ know where he was, although we now know that Oliver actually spent some of the five years that he was presumed dead far from Lian Yu.
For fans who have becoming increasingly frustrated with the flashbacks, seeing these come full circle is going to be a big relief.
In addition, this will be a wonderful way to wrap up the show’s fifth season, which has been all about coming full circle.
This will allow the show to focus on the current situation, and will give each season more time to explore characters and plotlines.