My husband applied for the document certifing permanent residence by the form EEA3 around the end of September(last month), and I am worried if UKBA could refuse his application, because it seems his case is not straight forward

He is an EEA national from one of the A8 countries.
Exercising the treaty rights in the UK over 5 years as below;
Aug 2008-Apr 2012 : Registered in HMRC as self-employed.
While keeping the employment status as self employed, he was sometimes employed by some different companies since September 2008, and he left the self-employed status in April 2012. Since then, he has been only employed.
Documents submitted are ;
# ID card
# Accountant letters, tax return forms, paid NIC bills and 2 invoice books over the period as self-employed.
# Payslips, P45 and P60 when he was employed.
# Bank statements over 5 years
# Registration certificate(EEA1)
I understand that applicants from A8 countries were required to register to WRS by April 2011, but he was exemption as he was self-employed until April 2012, although he was sometimes employed simultaneously, so never registered to the scheme.
Moreover, he obtained the registration certificate issued in July 2010 based on his self-employment status. I assume that it means the UKBA acknowledged he exercised the treaty rights as self-employed.
Reading through this forum, it is getting tougher to prove exercising the treaty rights as self-employed. Besides, how he has been excising the treaty rights is mixed up with self-employed and employed, along with the requirement to register to WRS.
I think he submitted documents to prove the eligibility as many as he could, but we are still anxious.
How does everyone think about his case?
Any thoughts appreciated.