I'm not an authority on Brad despite him being the only character I know... despite hitting S on DOA 4 and climbing my way into 5 before Ultimate came out (can never find ranked fights in ultimate) I know nothing of frame data, just what feels right.
But Brad online is really frustrating because Brad takes a lot of expert timing to pull off his longer combos, he's slow, everything he does is unsafe and too many characters have pics - easy juggles (I hate you Jann Lee).
As soon as a little lag hits, you miss your combos or his moves become painfully easy to see before they execute and now your stuff is getting blocked or you're getting countered.