Do you need to show the bank statements for the job proof? Of course it depends on what you're showing as a proof. As long as you have the experience letter according to the Canadian format (40 hours per week, employments dates, job duties described according to your NOC on company's letterhead), you might not need the bank statements for the job.
However, if you have your own account for POF, I wouldn't worry about another account you're using to prove a totally separate thing, especially since he's not a principal applicant!