The operative element is "could have." If the Hwangs are interested in changing the direction of the estate then all the overlap in the world won't matter. Having Joliveau spend more time with Pinguet would be less than unlikely to change the Hwangs' minds.
And as for the "risk" in letting absentee landlords get involved in the decision making, they are in fact the owners and are thus entitled to make any decisions that they would like to.
We, the wine geek community, may not like the direction of Huet, but we don't get a vote until after the decisons are made.

