Well,I liked it.I always thought it would be too easy just entering the castle like that.And it's only natural we get some sort of villains from the Kingdom itself,when they're clearly the real evil(or at least involved with) behind this arc(more important than Sabertooth or anything in the tournament).
Seeing Mira,Natsu,Wendy and Lily fighting will be nice.The weak team should be nice too(makes me think of Rave...)