I believe they gave the PPP a rest to break the cycle of their continuous leadership to formulate their long term strategic plan for the region by installing the coalition and using them for the same purpose.
The oil production is expected to pump in five years when general election is due. The Americans is very supportive of Venezuela opposition party. It is easier to support them from the borders to get Maduro out from the picture.
The Americans will not engaged in fighting Venezuela for Guyana. They will try to overthrow Maduro and make a deal with the opposition.
In all of this, the PPP may regain what was taken away from them at the next election in 2020.
Remember, it wouldn't be an easy task to pump oil from disputed waters while Maduro in power. Five years is good for the Americans to do clean job. The Americans will kill two birds with one stone.