Another fan cast from the Facebook page https://www.facebook.com/arrow.in.the.dccu
He says "
The CW Presents: Green Lantern The TV Show: It would be (in the beginning) less cosmic based and more so Earth based...with 2 or so Guardians acting like Jor-El in Man of Steel ... as per usual...fill in the blanks and leave thoughts below!"
and that "He cast Drew Roy as Hal becasuee the chemistry between Hal and Barry will feel more real if they are closer in age...and that the CWverse is aging down some of the characters"