Otherwise, participating in the steel furnace would reveal the biggest secret of the Mountain Domain. For a long time to come, the mining area will be the most important industry of the Mountain Domain. The technology must not leak at all costs.
In the end, there were just too few talents. Even if Hudson leveraged all his contacts for help in recruiting some managerial talents, the result was minimal.
People with true talent were basically monopolized by major nobles. Occasionally, a few might emerge amongst the noble children. Unless the family fell completely, it would be impossible to poach them.
The crux of the issue was that the Mountain Domain was not attractive enough for the talents. Even with Hudson's current wealth, it would be less useful than having a "good luck" hat to attract talents.
Good luck is vital for small nobles to successfully rise.