Thanks. Wow, that's awfully powerful. Why wouldn't you multiclass with Adepts then?
Because th Warblade's Dual Stance ability is actually more powerful than the Mo9's version, and Crusader 20 is perfectly viable for a Tank build (even if RKV or Mo9 are good options). Swordsage has little reason to stay in past 4 (it has some, but not enough for Setting Sun/Shadow Hand-focused builds to make up for the Medium BAB). Tiger Claw/Diamond Mind/Desert Wind-focused builds can make decent use of Swordsage's Dual Boost feature, enough to make up for the lack of good recovery mechanic/BAB.
Crusader 20 offers +6 Attack/Damage, 9th level maneuvers for White Raven, Stone Dragon, and Devoted Spirit. Master of Nine may be amazing for your maneuvers known, but it cuts so deeply into your feats/levels/skills to actually qualify that it doesn't justify trying the build for anything lower than 15th level, IIRC only 1 other PrC offers White Raven as an option (and Warblade is the better entry), and the only Stone Dragon PrC is kinda nerfed due to Medium BAB. The two classes that offer Devoted Spirit (aside from Mo9) both require spellcasting, and only one of those two makes for a decent Tank-oriented build. RKV is the best choice for a Gish-Tank build, but then you would be focusing more on Divine casting than on maneuvers (and Swordsage 2 makes for better entry, as it requires less Skill Points and boosts your stealth abilities, and has better Ability Dependency).
And who the hell enters Bloodclaw Master with a Crusader?