If Anakin was mismanaged, it was probably as a junior - and that can sometimes be accidental; I expect with his frame, everyone expected him to be a unit, but he has never developed the size to be a modern prop.
He seems to be the perfect size and shape to be a modern 9 - and if he'd trained as one, you can imagine him being up there in the McIllorum mould - nugetty, tough and direct. He certainly has the ticker and bravery to be right in the thick of it - but lacks impact when he hits a line of modern forwards, who are all 6 footers with 18 stone of muscle to deploy.