There is very little to be said about the grounding. For a fleet of in the region of 100 gliders spread around the country to all be grounded must have taken a systemic failure from the top to the bottom of the organisation - only the Cadets are blameless.
Reasons set out earlier in this and other threads. They've even been published in a book.
The big question I don't think I've seen addressed is what has been done to ensure yet another systemic top to bottom failure doesn't happen now the gliders are fit to fly again.
The failings resulted in the Hadden-Cave review and MoD set up the MAA. So you need to ask why the gliders were grounded four years after it was formed.