A380 wing fixes - Static load test results

[Flight Safety]

Interesting article on Flight Global regarding Airbus plans to fix the rib feet cracking issue. Sounds like they plan to make extensive mods to a large number of wing ribs in each wing, including extensive materials substitution for the ribs. Would mods this extensive, change the parameters of the ultimate load static test results for this wing?

Airbus admits no quick-fix for A380 wing-rib crack issue (http://www.flightglobal.com/news/articles/airbus-admits-no-quick-fix-for-a380-wing-rib-crack-issue-372288/)

[Lyman]

Flight Safety

Thanks for the link. I have a question regarding some scheduling issues?

But the airframer is "still working its way" through the approach to implementing the fix on in-service aircraft. Williams says a "nose-to-tail" grounding is one option, enabling completion in one session, but some customers might opt to split the fix across C-checks.

This comment is concerning. Any grounding is onerous, so understood why clients like C check softening of availability. If grounding is an "option", whose idea was it, and why is it "optional", since it has to have taken into account the urgency of the fix? Does this mean the regulator has signed off on the less urgent, more relaxed, approach?