I really don't get the issue with Crowther or why he's worth a thread of his own.
For me he was always going to make it eventually so whats the hurry. Also he isn't small despite what some say, he's bang average for a second row. He does the basics well and he has ticker.
No special attributes as such but that said he's the kind of player all teams need.
He could with application possibly become a top player - just look at Anthony Topou who was with us, all be it at fag end of his career. He looked nothing much but he played SOO so although size and speed help they are not the be all and end all.
FWIW if I were to advise Crowther I'd suggest the part of his body he concentrates on developing is his brain, in this world of robotic monsters that's where the future lays for the Crowther's of this world, it's simple just develop a Rugby brain - Watch - Listen and Learn.