Kakuryu is perhaps an unappreciated Yokozuna in his time. He has 6 Yusho under his belt, 7 times he was awarded the Gino-Sho, which a bit of quick reading shows this is the hardest award to receive (bit of trivia in 1988 no one was awarded the Gino-Sho all year) this supports the people who call Kakuryu a thinking man's yokozuna.
Kakuryu came through the ranks at a really top heavy time, he faced Asashoryu, Hakuho, Harumafuji, Kisenosato and he managed to break through to Yokozuna.
While Kakuryu doesn't get the credit he probably deserves for coming up in the era of Hakuho but always worth pointing out how old Sumo is, how long it's been around and to this point there have been only 73 people to make it all the way to the very top.