Ok let's make thia clear, there is a reason mid gets a mage or assasin, there is a reason adc is always a marksman, there is a reason for the current meta.
You mentioned something about a Caitlin taking too, well ye it may work if the top laner sucks. I faced a Caitlin top once. I was vlad. Her range was so annoying. She was winning the the lane till i got lvl 6 and i DESTROYED her. I made her useless, she could stay in lane for two seconds with me.
Another time i was playing MF against a shen top, i farmed pretty good, felt confident until he build a couple items and my whole advange dissapeared.
What i am saying is that an adc needs a support, they can't stay in lane effectively and safely with no support.
You see two ppl in bot lane. You know why? It's because dragon is in bot lane, therefore having more players in bot lane is easier to prevent enemies from getting it.
Mid lane has assasins and mages mostly, why??
It's because they can roam if they have to and get kills. Also some of them are very blue buff depended so they have to be in mid so they can't get the blue buff with the help of their jungler quickly.
Meta is hard to break because no matter what you come up with a well coordinated team of the current meta will win.
Just accept some facks. It's not a bad thing to try out new things and experiment but untill something really works, keep it out of ranked and have fun doing normal games.