Stay at Boulder ridge if you need 5 in a studio. Copper creek are smaller- and when you see the layout- a murphy bed wouldn't even fit as the rooms are too narrow. With the sofa bed pulled out you wouldnt be able to open the murphy bed- so I understand why it only sleeps 4 in the studio.
There are plenty of options of sleeping 5- which, lets keep in mind that you never had the option for 5 until 2013. Before then, it's always been four. BRV, BCV, BWV- all converted from 4 to 5. GFV and Poly started with 5. Bay Lake and CCV won't be able to have 5 ever due to the size of the rooms. I wouldnt be surprised to see SSR/OKW/AKL change one day to 5 if it proves popular (except the values at AKL)