My take on it would be to ask INZ themselves. Let's face it, one way or another your son will have to have his Sec 18A removed before he can sponsor you and the only ones who can do that are INZ. Whilst scouting around in the Operations Manual, in some places it said an immigration officer would notify when the 3 months was up but, in other places, it says the applicant has to notify them, which makes sense because the applicant has to provide evidence that the 3 months with the original company has been completed as required.
I really can't see why INZ would cause a problem as the 3-month requirement has been more than adequately fulfilled. I'd be extremely disappointed if they did although they do have some obscure little rules crop up now and again. Could your son not make a discreet general enquiry about the matter, just to test the water?
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Mother Bear 
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