It is all casting's fault, this is how i imagine this shit storm of a cast got together.
their first pick was obviously elissa, big brother had to keep the rachel gravy train going.
the next contestant was obviously mcrae, that's contestant number 2, why? cuz he was the most socially awkward guy they could find that resembled ian (bb14 winner and favorite). Since everyone LOVED how ian was with ashley, you have to find mcrae a girl he can mack on, so they found a hometown girl for him min minnesotta, and that was kaitlin.
after that, everything else was geographically stereo typical
they got the loud mouth i-talian (GM)
they got the smart good looking guy (can only come from ny, he though he isn't) Nick (the east coast ny'ers)
they got the cali surfer dude david (the west side)
they had to find someone with a beach body, and you goto florida for that, that's amanda (i personally don't like her body type, but she openly walked around with bandaid nipples so they knew what they were getting)
of course you have to have rednecks, it would be funny if the fat redneck was actually smart and the skinny redneck, ppl can barely understand him with his redneck-ish accent, so you grab a guy from tennessee and arkansas.
now that the redneck quota is filled up, you need to find minorities, since you already got the smart guy and i-talian girl from ny, you goto the next progressive city, chicago.
you find an asian female (because she serves as double minority), and you gotta find a gay guy, cuz lesbians are really boring.
now you gotta find black ppl, so you go back to the south and find the biggest mtherfcking black guy in mississippi.
since big brother has always had only 1 or 2 minorities, might as well go big for bb15 and find a third minority and get that black girl. She of course has to be southern, with an accent, but it'd be ironic if she knew english on an educational level. so while they were in texas... might as well just fill the rest of the cast, with a blond girl ditzy girl, a buff idiot, and lets grab another hot girl all from texas.
this is a shit theory, but what i said is all true, that's where everyone is from, and it feels like they just went on the dumbest roadtrip to grab nab contestants.