Because leaving a ton on would prove it's definitely not the same user and if he were to delete them he would lose activity, a quick glance and he will need to make up for about 5 months if he would trash those also.

The thing is pretty simple, it's obvious he is not the original user, if he keeps saying this he's a liar and it makes things worse, if he will simply say he got this account from an old relative that served in ww2 it might not be that big of a deal, he earned 355 merits according to BPIP so he would still be a full sr member on his own.
But again, bill gator account was red-tagged into -9 after confirming he bought his so, every DT with his own choice.