Kelley and Lanzing were the ones who finished Grayson when King and Seeley had to step away to get Batman and Nightwing ready for Rebirth, and they've done some filler since then - they're solid underrated talents with a really good pitch here, but even I can't say this NEEDS to exist over Seeley doing Robins, or even the Suicide Squad book given the guy behind that has apparently done some acclaimed non-superhero work. The most interesting aspect at this point is the concept art by Vasco Georgiev, especially that gorgeous spread of Superman facing "the gigakraken of Neptune":
As long as those editors weren't bullshitting about us probably seeing most of these pitches in some form down the road, I won't shed any tears for this not being the winner.