I like Kaz a lot but I would not put him above Dick Togo or TAKA. He's above Men's Teioh and Funaki although really there's no weakness in that top 5. Dick was probably the most rounded of all the KDX guys, while TAKA was the most pure talented.
Kaz had a great career with AJPW and its splinter companies after WCW as the Jr Heavy Ace and I'm a little surprised he's calling it quits already since as far as I know he's still in good shape and he could probably keep going for at least another 10 years. But if he's made his money it makes sense to get out now.