A motor home is a house. It's also a car. It's comparable to the first amphibians. They were still very much like fish, but also like reptiles.
An organism has more than 10000 pieces. There are trillions of base pairs in a single cell's DNA. And yes, sometimes changes do occur that might appear to be evolution going backwards, even though it has no direction.
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That's not backwards. That's just more change. You're assuming evolution has a direction. The only direction it has to male things different over time.
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The point is that chordates went from fins to legs and then back to fins.
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It still isn't 'going backwards' despite reverting to a previous state. The fact that a species manages to survive regardless of the path of evolution it has followed represents those genes successfully sustaining the species for a prolonged period of time. It all comes down to what conditions an area proves optimal for survival, and if that means fins are better than legs, then that's exactly what the best surviving species will eventually do
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Yes but the fins are not at all the same. The function is the same, but the structure is not.