Reselling from AliExpress and drop shipping are orthogonal issues. You don't buy drop shipped stuff on Amazon because it would take too long too arrive. The value of Amazon is having items in local warehouses already.
I've received things via DHL that I had no idea when ordered it was coming directly from China. However, being DHL, it arrived in 2-days. There was no signifincant offsetting charge for this delivery method.