your upperbody isnt going to get bigger cause you quit training legs
probably the opposite as squats stimulate hormones in your body and overall growth.
you're just a lazy fuck and have no right to call yourself a bodybuilder.
I have to chime in from experience on the truth of this statement. A few years back I had to take a year off from working out my legs due to a knee injury. Worst year lifting I have ever had. Zero gains, lost my vascularity completely, and trying to maintain my normal levels of being lean was extremely hard. I was doing personal bests for all my upper-body lifts but you couldn't tell by looking. My first month doing legs again I get pulled in to take a piss-test for AAS while I was in the USAF. An expensive but very nice compliment for a lifetime natty. It had nothing to due with size but how much more lean and vascular I was. Just because I started squats again. At the two month mark after training legs I put on a solid 10 pounds. Yea, some of it was water in my thighs due to inflammation most likely, but it was very much a visual difference in lean mass overall.
Get in the rack and squat. Quit making excuses.
edit: that one legged squat makes my knees hurt looking at it.