There are fish that can go onto land today. That does not make those fish the ancestors of land animals. So this fossil has bones in its front fins similar to human arm bones. Could that be because the fish actually could go on or very close to land and would have use for fins that could support its weight out of water?
In many cases, hypothetical missing links (such as feathered reptiles) would have been weeded out by natural selection unless their oddness conferred upon them usefulness. A reptile with feathers who couldn't fly (or who could fly but the feathers would not make it easier)would use up energy making feathers--energy which could be used for other things. Also, it would be a freak, so unless it could get lots of food, was very fast, etc. how would it have children?
A flightless reptile with feathers would still have an advantage over a featherless reptile. Feathers provide insulation, which would reduce the energy needed to keep warm and enable the reptile to live in a wider range of climates.