No problem.
It’s not out of the question, but it makes sense to start as they mean to go on. Indian rhinoceros would require more costly infrastructure than would be needed for Nilgai and Indian antelope, so it’s not a cost effective solution.
The main characters of Sloth Bear Mountain would be Sloth bears and Sri Lankan leopard and an attraction in their own right, so Indian rhinoceros aren’t necessarily needed like they were before in our previous concept designs (which saw Indian rhinoceros take centre stage).
I’d be surprised if they acquired Banteng. They basically look like domestic cattle. It’s possible - as the goal is to find ungulates from India and they fulfil this niche, but Nilgai and Indian antelope are better choices imo.