We really can't draw any even weak inferences here. The only thing we know is that life that is much like ourselves is possible. We can not in any way say if it

We really can't draw any even weak inferences here. The only thing we know is that life that is much like ourselves is possible. We can not in any way say if it is common, or so exceedingly unlikely that we are the only example. The only data point we have is that we exist, but that data point confers no information, since it is a given. If we did not exist, we could not consider it. So we know that one example of life exists, the Earth. The question we are trying to answer is, does a second example exist. For this, we have no information other than that it is possible.