Are you fit, or are you not fit? If you are not fit, then why would you not want to try to loose weight?
Also if you are not fit, and trying to get in OCS soon, you need to start cracking right away anyways, PFT standards arent that hard, but, they take some work to catch up with.
And if you are fit, they shouldn't give you a hard time. A SEAL applicant (prior enlisted SEAL who then went on to play football at UT was at MEPS at the same time as me. He was 6'6 and as wayyyyy over weight. However, he was a monster of pure muslce, so, it wasnt a problem obviously.