Why does everyone think that Nozuki's name is now Warbat? If you looked even a little bit into past Monsterverse toylines, you'll see that Lanard renamed every Skull Island creature (that wasn't Kong) to something more generic and easier for kids to memorize. Who's to say the same's not going on here?
Nozuki, not Warbat
We can't just assume the name from an older leaked image is official because we think it's cooler.
My personal theory is that "Warbat" is the name of the species, and Nozuki is the name of their alpha, like the Skull Devil/Ramarak is to the Skullcrawlers.
But that's just me.
Multiple Kong-sized Warbats make that less likely.