I see Ngola (son of Jambo and N’Pongo) went to Zurich in 1984, which is the year that Hobbit came to Jersey, so it appears to have been a direct exchange with the intention of Hobbit heading up a second troop as you say. Jambo died in 1992, so had Hobbit remained on site, I’m willing to bet he would have been more successful in siring young than Mzuri ever was.
I’m not aware of the den configurations, but I know the keepers hurried to make preparations for Jambo’s troop to enter the dens during the incident. Perhaps securing the large family troop took priority over allowing the adolescent access to the exhibit. They two groups couldn’t mix and securing multiple adults and young may have been the trade off.
Hobbit was also handraised from early on so may also have been problematic breeding -wise. Jersey's mistake with Mzuri was taking on both an immature and handraised male and putting him with older females- they dominated him badly apart from Hallali who was similar age- she became his companion and he mated her but not the others. He had just the one surviving offspring Mapema(male).
The dens at Jersey(as it was then) comprise two onshow dens with a grille between them, and 3/4 offshow smaller ones. I don't know if Hobbit was allowed to be close to Jambo in the adjacent onshow den- or not. Its possible Jambo reacted badly to him. On the day in question I suspect that Jambo and family were shut outside as usual (that was their practise) and Hobbit was in the 2nd inside area. But exactly why he was let out we will never know.
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