Granted, a non-super-powered human hanging out with a ton of heroes on a regular basis isn’t exactly uncommon in superhero television these days, but Dauberman could be hinting that the show would like to further establish Swamp Thing Alec Holland before throwing more heroes into the mix.
Dauberman told Slashfilm he thinks it’s possible Swamp Thing and Titans could come together down the road, but only if they could organically make it happen.
He added a bulk of this season is told through the eyes of Crystal Reed’s Abby Arcane, which may be why a crossover wasn’t even discussed for Season 1.