At level 45 Grungli, at best, will reward you with 9 Major shards, for 236 ore.
Compared to Mutiny for the same 236 ore can get you, at best, 2 Dungeon/Skirmish loot tickets. At best, those 2 can get you shards and gear/pets/spells that can be salved into shards. The best outcome is likely 50ish shards considering gear/pets/spells have a chance to have levels now.
In fact, due to the change in gear, pets, and spells having an opportunity to be leveled, they all outperform Grungli. For example, a level 15 spell will salvage into 19-23 shards with a chance to get scrolls and relics.
I suggest increasing Grungli to 5-20, with a chance to double to bring him inline with the rest of the resource generators.