does anyone think this could be a good theory?

i have a theory that before the evil queen cast the curse, she ripped out abigal's heart which made her under the queen's control which is why kathryn is such good friends with regina. so the heart in the box could definetly be kat's or in other words abigal's. also i feel kat's affections for david are all part of the queen's curse to keep david and mary apart. since regina pulled out graham's heart which made him her pet, i feel that since kat is shown to be friends with regina then that must mean that regina took out abigal's heart to make her under her control. i hope everything i said made sense lol