I wonder, if the curse was never cast, would Belle have spent those 30 years in Regina’s tower?
Probably not, if Regina meet Robin and was happy, she would not be evil, what can happen, is that maybe Belle may be also old one, actually would also explain a old Morpheus, he was born back then while Rumple was trying to cast the curse to find Bae, if bae is alive and he is still looking for him, also in this AU maybe Rumple will still make Snowing meet so that he can use Emma to make her cast the curse.
If they are doing Flashpoint, like Flash is doing, they can do that to say that in this AU some dead characters are alive and even there is a talk about good ones are bad, would fit the dark Robin in this AU.
"I offended you with my opinion? Ha, you should hear the ones I keep to myself".