Thank you for replying weddlesplash.
The problem with idualwifi not initializing is probably a bug in the FreeBSD driver. It does actually occur on on FreeBSD, too
Really? Through my investigation,I don’t think so.
I already mentioned in this thread, and confirmed that this problem is NOT OCCURRED in GhostBSD via EFI boot.
If this problem is occurred in pure FreeBSD also,It may be worth to compare the driver’s codes with GhostBSD’s one.
It may be a hint for me to fix this problem.
Thank you for that again.
Anyway, Nobody may have solved it and reached the cause yet.
So I will keep my investigation and fix it first! 
I think it is the second matter that where is the best/better place to fix it.
The first matter is to fix it!