That's how the pickups booster works huh? I suppose it's true since it needs to 'see' the pickups impedance for it to function well, but technically clean boosts are usually AFTER dirts to provide a jump in volume.
Whether TOD first or OCD first depends on WHICH inherent drive you'd rather use as your main body. If you prefer the overall TOD sound than by all means place it last, if you prefer the OCD then place it last. I prefer to place my highest gain pedals at the back of the chain (like your OCD) since I find that feeding a high gain into a low gain pedal has that 'starving' effect on the tone. Just doesn't seem natural to me. But what do I know, I'm a fuzz guy!