>3.  Hybrid vigor "solves" issues related to inbreeding (in honeybees this is stark and clear because any inbreeding wrt the sex determination gene leads to nonviable diploid drones...cross such an inbred queen with another inbred queen whoes inbreeding is based on a different version of the sex determination gene, and you will have no diploid drones from the offspring queen).

Hi 
That's not how it works with diploid drones and you can't talk about queens crossing with queens anyway.
A queen carries two sex alleles.
The diploid drone problem occurs when a virgin queen mates with one or more drones which carry either of the these two sex alleles.
There are approximately 19 different sex alleles.
Either  closely related drones or a completely unrelated drones could carry one or the other of the two sex alleles carried by the virgin queen.
Obviously in a closed population of closely related individuals the probability of a queen producing diploid drones will increase.

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