Suitability is not the primary issue. Statutory eligibility is. A&B falls into the same category as failure to report a hotel fire or receipt for deposit by insolvent banking institution - a state level firearms owner ship disqualifier.
Any "crime of violence", misdemeanor, misdafelony or felony is cause for a state level prohibition on firearms ownership. (misdafelony and felony are federal prohibitions). FLRB relief *may* be possible, but if it was a misdafelony, such relief will not be recognized by the feds (other threads exist on this topic).
He definitely needs legal advice from a "gun law attorney". If the attorney does not understand the term "misdafelony", look elsewhere for advice. Keith Langer and Jason Guida come to mind.
It is VERY EASY for make things more difficult by applying without legal advice, get denied, then try to straighten it out than to get a priori advice.
One thing he can do for homework is get court certified records of his CWOFs and conviction.
And tell him to book a paid consult rather than get an attorney he has no relationship on the phone and start asking quesitons other than "when can we meet, where, and how much will it cost me?". It will save a certain atorney the trouble of sending out a leech alert to the legal community.