The dark art of upgrades! It's seems EK has built some of its rep on the surprise upgrade so I wouldn't be surprised if they did on occasion upgrade for reasons other than rank. I have sometimes wondered darkly whether someone with a lower tier was upgraded ahead of me even as an io. I don't actually mind if they ran some algorithm that was biased towards tier but not guaranteed. Obviously would never be that sophisticated but I can't in all honesty begrudge someone else a discretionary upgrade as long a it wasn't the norm! Most will probably say RHiP should take precedence but life is too short!