Muddle over ESA

HI my partner was recently found fit for work and removed from ESA to JSA. He is appealing the findings of the medical and assessment. The Job centre have informed him that if he gets a sick certificate from his GP he can go back on ESA but still get the JSA benefits . This seems to infer that he is being treated as a new claimant and therefore since the April changes will not get the old ESA allowance that terminated in September. However he argues that since he is appealing it is still an old claim and therefore he should be put back on the old ESA benefit until his appeal is heard by the tribunal... Where does he stand do you think?