Correct, a locked at&t Edge will work on Cricket. There is plenty of bloatware specific to AT&T that you'll have to disable and can't delete. AT&T Remote Support CAN'T be disabled or deleted (92kb). I was able to disable these apps: AT&T Locker (576 KB), AT&T Protect Plus 172 KB, Device Help (24 KB), DirecTV ****(284 KB), myAT&T (7.27 MB).
***DirecTV app was still updating in the Play Store even though it was disabled. It would bring back the Remote in notifications. I contacted at&t and chatted with 3 reps and they didn't have a solution, but maybe they fixed it after that conversation because it's no longer being updated.
There is more bloatware in addition to those listed not specific to at&t, but I'm just happy that DirecTV is really disabled now.