NO 1A stamp on entry

[jutt_don]

hi my friend he is Pakistani and got married with a polish girl in Cyprus and he has been issued a residence card of non EU citizen family member of union citizen which is issued by CIVIL REGISTRY AND MIGRATION DEPARTMENT and it is on a yellow A4 size paper and on top rite corner there is a logo of EU. with this paper he travel from Germany to republic of Ireland with his wife and then from Ireland he travel to Gatwick London with his wife together and immigration officer didn't stamp code 1A stamp on his passport and let them enter UK. so this is the case and now i need some help.
1) can he apply for EEA2?
2) can he work before he got EEA2? if anyone offer him a job the employer is ok with that or is it illegal to employ him?
3) how long he can stay like this because his wife came to uk first time and need national insurance number to get job.