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Bank statement is submitted along with the Affidavit-of-support only if you have more than one applicant for AOS/CP (other than the primary applicant)to ensure that the primary applicant will take of the secondary without them becoming responsibility of the state.
If you are the only applicant then you don\'t HAVE to submit as you will have to W-2\'s and paystub\'s to prove that you can support yourself.
BTW, may be it is none of my business, but, do you have a problem submitting a Bank statement? How do you know if your friend is right?
for all you know he might get an RFE later( if he has not got his GC yet).