I am reviewing the i2c based boards I finished to make sure the SDA/SCL pairs are more consistently laid out. I was lazy about it, but it is now a concern that I am implementing an i2c switch and I want to make sure to minimize the need for vias when Flex Modules are attached to circuit boards. So some of the boards may have their pins reorganized so they can benefit. I will likely settle on slaves with top of board counter-clockwise VDD, GND, SCL, SDA pin layout. The i2c Switch slave will be the same, but masters out will be the reverse (so they connect with the slaves).