Beakor
having fuel for dest (closed) + two alternates means you have trip fuel to destination and fuel to reach further of two alternates after G/A at dest. So if dest doesn't open you divert to altn early and have more than final reserve fuel at landing but you can not reach the other altn if the first one get closed for non-wx reason.
alatnariver
I'm NOT trying to cover all posibilities. I'm not asking what if suprasingly destination gets blocked and than alternate gets blocked too. This would be 2 or more eventualities and we would start an neverending story
Jar allows for no alternates but only in good wx if there are 2 runways at destination because one can get blocked