Man Jai is in an awkward position as he’ll be close to a decade older than the next cohort of calves. Since he has little value at Werribee (he’s directly related to 2/3 breeding cows), I’d be in favour of sending him to Taronga Western Plains Zoo to integrate with Pathi Harn and Sabai - with the view of two or three of them transferring to Taronga Zoo - the third could be exported if Taronga didn’t feel they had the room or management issues arose.
Though Werribee will initially have space to manage the bulls it has, a cohort of bulls born over the next five years ago will form a more cohesive bachelor herd long term. Man Jai’s value to this would be of that of a mentor, but there’s no reason Luk Chai (a well socialised bull) couldn’t fulfil this role as he’s currently doing to Man Jai.
The current plans for Man Jai are to move him into a bachelor group at Werribee. He could possibly be integrated with the upcoming group of males, and be used as a mentor for them; and if this doesn't work out, he could be sent overseas. I don’t see Taronga willing to take on Man Jai, especially since they’ll be expecting male calves of their own, and will have to work that out space wise.
On the subject of Taronga holding bulls, I doubt they’d hold more than two unless they really really need too. The space just isn’t there. They do have the space though to seperate both males from one another if needed, which may come in handy during musth ect.