Glentract
We are already talking about the best of the best. Those "three of the best" he killed are still dramatically weaker than top level people.
Tiin, Kolar, and Fisto were "celebrated swordsmen" (The Complete Visual Dictionary) and highly reputed by Anakin Skywalker, Mace Windu, and Obi-Wan Kenobi; enough that Kenobi and Skywalker both agree that they were among the very best that the Order ever produced. Fisto, in particular, has demonstrated enough skill with the blade to outduel General Grievous in the Clone Wars television series. The fact that they were unable to contend with Sidious isn't due to a lack of skill, but Palpatine's superior command and aptitude for the Force.
Glentract
Also, I never said he was bad at combat, it's just inferior to his political skills.
I would agree that his penchant for manipulation outweighs his talent with the blade, but that doesn't change the fact that he's among the very best in either category.
Glentract
Kun, Ragnos, and Bane were not crafty like Sidious. That wasn't their game.
While I can't speak for Kun, I can tell you that Ragnos and Bane were crafty like Sidious. The Essential Guide to the Force and Dark Side Sourcebook make it very clear that Ragnos's rule was unnaturally long due to his skills in manipulation; he used his rivals like pawns on a chessboard and pitted them against one another, rather like Sidious's sadistic displays during the Empire's reign. Bane, too, opted for subtlety rather than blatant warlord tactics and it was his philosophy that Sidious used to defeat the Republic.
The only difference is that Sidious did his manipulations on a far greater scale than either Bane or Ragnos.
Glentract
You know me, I don't take outside quotes with much merit anyway. I've said for the longest time that we need to look at feats first and foremost, with in-universe quotes being very important as well. What an out of universe person might have said doesn't change what is actually portrayed in the books, comics, movies, etc so should have no higher authority than fan generated consensus.
I do know you, and I clearly recall a time when you were willing to accept any statement... so long as it pertained to a character you liked. We don't cherrypick anymore. If it's a canon statement and not contradicted by another (higher) source, it's incontrovertible.