Thought #1:

i think at some point daragon became real but they eventually broke up (base on alive album). But i think they are trying to get back at least the friendship or how they used to be. 

Thought #2:

it can also be possible that GD had a crush on dara since before dara's debut but they didn't work out. And they really are just friends now. 

Thought #3:

they can be together and just had a falling out (with the whole scandal thing of gd's). The way gd reacts at things related to dara is just too suspicious that its impossible for fans to think that there is nothing going on. The same accessories and clothes can be evidence of their fondness of each other but these things can also be just pure coincidence. 

Thought #4:

kiko mizuhara. I dont hate her. I actually find her pretty and she's a good model. But i cant shake off the feeling that there is something more to her involvement with gd other than just being friends. 

Thought #5:

butterfly mv. I mean cmon applers and non-applers can agree that the girl really looks like dara. Their similarity in regards to appearance is just too impossible to deny. I thought about it in a different angle like you know those dress up games wherein u pick the makeup clothes etc of a girl. Those faces are really cmon but the girl in mv has dara's features. I mean if they didnt have dara as inspiration they could have made a different looking girl right?? 

Thought #6:

the 3 lettered name in gd's lyrics. I'm not korean but being exposed to kpop for so long i learned that 3 lettered names for koreans are actually 3 syllables if compared to roman writing. It is also  rare for koreans to have a 3 lettered name. And the only person associated to gd woth a 3 lettered name that is known to the public is san-da-ra park. 

Thought #7:

remember the last part of butterfly? "Jagiya its your turn lalala~" i discovered from other appler's investigation that on gd's heartbraker album, after the song butterfly, the next track is hello (ft san-da-ra). Its also noteable that dara's name was written as sandara other than her stage name, dara, despite the fact that 2ne1 already debuted during that time. 

These are just my thoughts, opinions about the whole daragon phenomenon ^^. HATERS- mother father! >:)