So did Justin sun receive 10million hive or not?

I don’t know how much HIVE Justin may have received. We don’t know customer balances on exchanges.

Why the heck did cz binance get an airdrop?

They received the airdrop because they stated that they would participate in it and distribute the HIVE tokens to their customers.

My personal opinion when discussing this before the fork was that we should not drop to exchanges. There are pros and cons associated with that but it was my opinion that the pros outweighed the cons in this case.

...if you made an exclusion for Justin suns main account...

I don’t believe there were any exceptions made for any particular accounts. What exactly are you referring to?