It's important to remember that they only recently got new team members on board, and even then, I'm sure they still feel the need to pump out content in other areas of the game while work on Bates continues on the side, just so that we don't end up with months where all we get is "We're working on Bates! That's all, folks!"
I'd say it's especially true now, with the addition of threesomes. Going back and doing full animations with 3 characters while still including an NPC with their own animation is definitely quite a lot to add on top of what they're already working on with Bates.
I definitely want Bates to be a good change from the norm as far as gameplay's concerned, (The addition of Poise and AI improvements along the way are nice changes they've done along the way that will 100% impact how Bates operates) and I'd be lying if I said I wouldn't be a little disappointed if he's more or less a beefier generic mob enemy, but worse comes to worst, at least he'll have plenty to look at regardless...
But hopefully it won't come to that. I want OSH to succeed as a game too, rather than just "Porn with a game attached to it."