One of the bigger criticisms for DC property shows such as 'Supergirl' is that it exist on another network apart from the CW where a DC universe has already been established.

This would make sense for the network to just make itself home for anything DC, and at the Television Critics Association Press Tour, CW's president Mark Pedowitz explained why this didn't happen.

"The network has achieved one of its intended missions -- bring in more male viewers -- with its DC superhero dramas, Arrow and The Flash, both of which are top performers for the network," he said. "Those shows, as well as the network's other genre-centric series, made it seem like the more logical home for the forthcoming youth-oriented series Supergirl - but that show ultimately flew over to sister network CBS. (CBS Corp. and Warner Bros co-own the CW.)"

He also goes on the say that the 'Legends of Tomorrow' series will seal the lid on DC spin-off series for now. This show will only allow for more characters and stories to be introduced, leaving much more room for this to grow if they wanted it to.

"Pedowitz noted, as CBS Entertainment chief Nina Tassler did on Monday, that there would be cross-promotion of its current DC properties with CBS' "Supergirl." But as far as story-line crossovers, Pedowitz said he's leaving that up to "Arrow"/"The Flash" executive producer Greg Berlanti," writes LA Times.

"We're open to crossovers," Pedowitz said. "It's Greg's call because he understands his shows."