I am speaking from my own observations and nothing scientific such as reading 
the code or designing the process.

> A) Resilver = Defrag. True/false?

False

> B) If I buy larger drives and resilver, does defrag
> happen?

No.  The first X sectors of the bigger drive are identical to the smaller 
drive, fragments and all.

> C) Does zfs send zfs receive mean it will defrag?

Yes.  The data is laid out on the receiving side in a sane manner, until it 
later becomes fragmented.
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