If the ADC said that, he's smoking crack. The guys who are ADCs aren't veteran former SJAs, they are the junior guys. ADCs are like public defenders -- they're over-loaded with cases, and can't spend the kind of time on any one case that a civilian attorney can. In addition, ADCs generally don't have the depth of experience that a good former-JAG civilian attorney will. I've seen it in action personally, and not only could the ex-SJA civilian lawyers run circles around the SJAs they were opposing, they were also doing a healthy bit of teaching to the poor ADCs who were assisting them. No comparison, in my book.
For anyone who ever has the opportunity to be represented by legal counsel in proceedings against the US Gov, I highly highly recommend hiring civilian representation in addition to retaining the services of the ADC.