i really don't think there are any defenders that will improve in overall ratings with technique team style. My understanding of overall ratings (even though i think its the most useless shit ever) is that it chooses some stats of the player that konami thinks are important for a certain position, and some how comes up with a number that is supposed to reflect how good the player is in that position. Technique is definitely not something that important for CB for it to be included in the calculation of the overall ratings.