Oldman
No you are the first where we have seen this happen.
PIP and ESA are supposed to be classed as independent benefits and it has so far been DWP policy not to allow a result for one benefit to affect the award of the other, as long it is done for positive reasons then this should not be an issue, but I hope that it does not signify a return to the old days of DLA and ESA.
Congratulations on your award, your ESA(CB) will remain in payment as long as you are in the SG.
Gordon
Nothing on this board constitutes legal advice - always consult a professional about specific problems