Cisco SAN Zone Creation HELP!!!!

Need some help sorting out best practice vs what other people decide to do.

I have been tasked with creating a new storage zone for a new server in our system.

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SAN Switch: Cisco MDS 9250i - 2 for fabA, 2 for fabB.

Storage: Hitachi Gwhatever

Platform: Cisco UCS with VMware

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Questions I have:

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1. I am seeing zones using only FCalias' or only device-alias'. SOMETIMES I AM SEEING ZONES WITH ONE FCALIAS AND ONE DEVICE-ALIAS TOGETHER IN THE SAME ZONE.
   1. Isn't it preferable to use device-alias over FCalias?
   2. Is it safe to assume our SAN switching has had multiple hands in it and one tech preferred FCalias and one preferred device alias? and now i'm seeing their work put together in fancy ways?
2. I am assuming FCalias and device-alias can be used together in a zone as long as the FCID remains correct for its use?
   1. caveat that an FCalias thats created in a VSAN has to stay there, but device-alias can be used across any VSAN?
3. Can you have a PWWN as both a device-alias AND an FCalias?
   1. Im guessing this is not advisable because why would you?