I dont think a Led Zep concert would be anything less than it was at O2 and that was a hell of a show, I must have watched and enjoyed it a thousand times.
Personally I don't see any reason to go the "old bands shouldn't come back to activity because they wouldn't sound the same".
I mean, WHO does? No band sounds like they sounded in the 70s and that's normal...
As for Bonham, I think Jason held his ground pretty well. Plus, it all stays within the family.