Guide 5772 has already listed the minimum income levels for 2013, 2012 and 2011. Note just below the table, it says "if you are applying in 2015, you must provide proof of income from CRA for taxation years of 2013, 2012, 2011". So NOA and Option C Prints for 2013, 2012 and 2011 are the only proofs to provide. Any other income documentation will not be accepted.
So those who want to provide income by submitting paystubs, or 2014 paystubs because they didn't meet 2011 minimum level are not going to get anywhere.