May I ask, is the right arm, hand and top of grave fitting in okay and that gap between the foot the only issue? Also is he wobbling with the gap?
If you’re good on those two questions just get the little pad and you’ll be fine. I would suggest showing that picture to the seller and asking for a partial refund if you can live with it. I have to wedge paper towel between pieces to hold knives, switch outs etc. sometimes so they don’t slip out.