Jyoti,
I just loved the way you put it.............Almost correct.👏👏👏 The only point where I would differ a bit from you is that Katie just can't be Fully DPS incarnated because she absolutely lacks his firmness 😛 So she is only partly Dev incarnated because she is a little bit ziddi and slightly more angrier than Devinder.
Now if you look at Devinder and Katie with the above explanation, their behaviour will make more sense 😆😆😆
Michelle
Ok so the equation goes like this
Half-Dev-Reincarnated+Half Kaajjal-Reincarnated---->Full Katie😕
Full-Adi-Reincarnated+Half Kaajjal Reincarnated---->Full Devinder😕
Well mayb now it will make some sense😆😛