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Collecting from all 4 would definetely be better, but as yours is (should be anyway) the heated version it's not totally out of whack, it's just not the ideal way of doing it.
Prime advantage of sampling all cylinders is getting the better average reading. Worst case scenario would be you could drop one of the cylinders not being sampled and the system would never know the difference because the sensor readings would never pick it up. (then that dead cylinder ends up with whatever a too rich or too lean mixture does to it over time)
Of course now that you've got the bung in, its a bit too late to change, but in the future you'll likely want to get that reconciled. (the heated elements arent as evil in their requirements AFA how close they have to be to the head, which is the real issue associated with the single wire versions: they cool off and stop sending signals if you're not actually moving down the road at X pace)
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