Simple decision.
If you land just ANYWHERE else on that route (apart from the destination) where do you.......
Accomodate the pax?
How much to put up the pax (at your origin a good percentage can go back home if they don't want to try alternatives!)
How do you get a replacementTrent 900 to your diversion airfield?
How do you get the pax off this beast? Stairs /airbridges etc?
How do you get to the terminal (wingspan / weight etc)?
Is there anyone who know ANYTHING about the A380 at your diversion?
Is there any engine change equipment, access equipment, servicing equipment at your diversion?
Security? Staff? Engineers? Engine ground run facilities?
I could go on and on and on and on....
Give us a good reason why the crew didn't make a good decision...? ...silence.....
Now let's get back to why the donk failed, that's the more interesting part of all of this....