Look, it just doesn't matter. Soreness is a side-effect of trauma not an indication of growth. That is certainly not the way to work you bi's but as for as what you did what matters is if it represents more stimulus than what you did before. It never ceases to amaze me that PROGRESSION, the most simple and basic concept related to resistance training, is the number one thing nobody seems to mention when they talk about soreness, muscle growth, etc.
You just have to progress in some way. You can't keep progressing for very long and not grow. Hell that applies to almost everyone but elite olympic weight lifters with freaky genetics....and most of them too.