Having the Jd is obviously bad but it still depends entirely on how hideously skewed the guy is one way or the other.
If this is the first time I see him do it, I would guess heavy in value because:
-both FDs bricked (more likely to try and bluff small)
-A high flop
-u called a turn overbet
His value is AK as a minimum so AJ is the same hand as A5 but with worse blockers.
I think easy fold, the flop size is one of the biggest tells since most regs would bet this spot small so when size up it's probably nuts, then overbetting turn if bluffing probably with draws not air which would give up river often
