Well done to you, Floo, in looking after your guy with such a terrible injury. I used to work in a stroke clinic, and they were all full of determination to recover as much speech and language as they could. Many of them had aphasia also, but there are different kinds. I remember that some lost vocabulary, and some lost grammar, and there are mixed kinds, but I expect the analysis has moved on since then. We did endless drills with vocab, which was easy for some, and impossible for others.