Regarding market share:
The share of the market that an enterprise enjoys has always been the prerogative of the market. Even my teenage kids know that, FFS. If a chain was run by idiots insisting on keeping a thousand unpatronised stores open would they still have 65% market share? They'd certainly have the lion's share of the costs, but not so much for revenue.
Gareth is an empty suit. Anyone who has survived the last ten years of fawning acquiescence to a failed strategy is, by definition, equally wanting in both the courage and foresight departments.