hey, everyone ~ please accept my sincere thanks for the kind words, and i am glad that it is sparking some discussion on trying a few new things.
wenrdog - i think that cavender's is an outstanding seasoning - use it all the time and it sounds like you made great use of it here! that tzatziki is indeed good, isn't it? i rarely use sauce for ribs, simply brushing on layers of a mop on top of a rub (followed sometimes by a glaze), but this was really, really good. and i think a perfect compliment for the gree flavours. will definitely be doing this again in the future, and i'm still committed to trying it with pulled pork as a gyro-style meal.
if anyone else wants to try this and has questions, let me know. if you do try it, please post on the results!