You're currently adhering to 5/3/1 and you're wondering if squatting once/week is enough to make gains? Are you currently making gains? if the answer to the second question is yes, then the answer to the first question is also yes. At least for now.
Otherwise, I agree with Chris that as it's laid out, if you want to add in C&Js, move them to monday and make Friday a true rest day, or at least some sort of active recovery. Go play frisbee or something on that day.
And if you don't think kettleball squat cleans are difficult, I say, step up to the med-ball
- CJ Kim