Hmmm, I'm not sure about this physical thing. The player Prosser most reminds me of in style is Teddy Sheringham and he was hardly the most physical type.
Just cos he's a lanky fooker doesnt mean he should be strong and hard. He could run about a bit more, he has the appearance of being lazy and languid, but he can splt a defence with a pass no problem. For me he's not a proper striker but more deep lying and I do continue to wonder how much we watched him and if we really knew what we were getting?
I hope you don't mean like Aluko, the position he seemed to be playing last night.