Will it be okay if I get a joint sponsor even when I don't know if the main petitioner meets the 125% poverty guideline?

I already got a RFE because my I-864 was wrong and it said that the main petitioner didn't meet the minimum requirements. I even included a joint sponsor that absolutely did, but it didn't work. I don't know if doing the same thing would be okay. What could happen if the main petitioner does meet the minimum requirements and he got a joint sponsor anyway?