- If they did fight, why would that be a throwback to the theory? It doesn’t mean either one of them would have been wiped out.
- They might have filled quite separate niches that didn’t come into direct conflict.
- They might have inhabited different areas, e.g. Sligs in a swamped forest, Vykkers in a deciduous forest.
But I’m still not fond of the arborial Slig hypothesis.
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I think it's possible that the tail was origially a single leg designed for them to hop on (ala Gabbits and Meeps) but as they evolved they couldn't bear their bodies' weight on the leg so it became more atrophied and turned into a tail.
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If Sligs’ weight was becoming too much for their leg, it’s much more likely that they would have stopped evolving heavier bodies. It also begs the question of why they were evolving larger bodies in the first place.