I'm afraid it does markjo, and I think Pongo, Ski, and I are all thinking along much the same lines. Ski's point is simply that all possibilities are equally possible, if possibility is all that we are talking about. However, though they are all equally possible, they cannot all be equally true. Specifically, some (indeed many) possibilities are mutually exclusive. If our goal is to determine which possibilities are true, we must set criteria which believe lead from the merely possible to the actual.
Saying that we "should not dismiss [a possibility] out of hand" is therefore a meaningless comment. The fact that it is possible means, by definition, that it is not impossible, and therefore we cannot dismiss it out of hand. There is no practical difference between not dismissing a model and not accepting it. However, when it comes to what we will accept, Ski is quite right to demand evidence of what is actually true, for that is not so clear-cut: one needs criteria for determining the veridical actual.