Here's something I don't think people are taking into account: I think Jason Brown and his team likes perfect programs with no -GOE (or rather, with tons of +GOE). I think that is the gold standard for him and his team.
He did attempt the 3A in a summer comp and while far from perfect (it was two-footed and UR), it's indicative that it's not that he can't do the jump AT ALL. It's that he can't do the jump perfectly.
I'm sure his team knows about Brown's reputation as a all-around packaged skater, so the last thing they want to do is to have that marred by bad 3A attempts. Because he has great choreo, good jump technique on his other jumps and expression, he can get away with this for now. A skater like Kevin Reynolds, for example, doesn't have anything like that, so he has to relay on his jumps — even if they're not executed very well (his quads are pretty cool; but he's had his share of bad 3As).
That said -- yes Brown absolutely needs the 3A (or he can go the Lambiel route and focus on a quad) and his team is aware of that. But I believe there is a long-tail strategy in Brown's development. For those who don't know what that is — in business it means selling "more" unique or hard-to-find items rather than a large volume of a small number of popular items.
In Brown's case, it means not selling — for now — the everyone-must-have 3A and instead selling qualities not seen by those other skaters — great chreo, clean +GOE programs, consistent 7-triple jump programs, expression to the music.
So now we know Brown can do perfect programs. The next step, logistically is perfect programs with 3As