Well, I don't know about all this Blackguard and Paladin discussion, but I do know this:
From this link:
http://www.wizards.com/leaving.asp?.../showpost.php?p=9899969&postcount=227&origin=
Q: Alright, so the Swordsage's AC Bonus ability states "Starting at 2nd level, you can add you Wisdom modifer as a bonus to Armor Class, so long as you wear light armor, are encumbered, and do not use a shield."
Does this mean that you can't use this ability when you are unarmored, ONLY in light armor? By RAW it does but... is it a mistake for errata, should I inform my DM that it works with no armor as well?
A:The intent is that you get this benefit whether you are wearing light armor or are unarmored. I will pass this issue along to the appropriate departments for potential errata treatment. Of course your DM is allowed to rule however he/she wishes. Thank you for bringing this to our attention!
and no link on this one, but its from an email on page 9 of this thread:
http://boards.wizards.com/showthread.php?t=683775
Q: Does a Swordsage 4/Sorcerer 4 with the Ascetic Mage feat add his Wisdom to his AC or his Charisma? What if the character was instead a Swordsage 4/Sorcerer 4/Monk 4 (thus getting his Wisdom to AC through 2 sources: Swordsage and Monk)?
Heck if I had a Swordsage 4/Monk 4 would he add his Wisdom to his AC twice?
A: A Swrodsage gets to add wisdom to AC and the Ascetic Sorcerer would add Charisma, both are applied. A Swordsage Monk uses the same addition, but it does not apply twice. Each class lets you use the stat modifier to increase your AC, but this does not mean you get to use it twice. All Classes get to add their Dex modifiers to there AC, but when you multi class you do not add it again for each class that you have.