Fail to overthrow the Emperor, yes, but there is more than one way to strike back against darkness.
Hantei XL, contrary to Fu Leng in KYD, decided to play by the rules. Any samurai willing to accept him as the legitimate Emperor is free to continue his life. Maho and corruption is also under strict control. It also means the great clans have a powerful influence on his reign. In order to take the throne, he had to make concessions and promises to his allies.
With the Crane in control of the courts and bureaucracy without those damned Otomo (although the Susumu and Shosuro are still a bother), Hantei XL is far from having absolue power.
The starting point is a much darker Rokugan, and the new dynasty is, by fiat, untouchable, but everything else is to be determined. Champions and Chosen will still be named, the emperors Emperor will still need spouses and the winter courts will still happen. And the Spiders are not the only contenders. In respect of Shourido traditions, only the bests will be selected, no matter the clan, and the sooner a great clan plays ball, the greater his chance of influencing the Empire has a whole.