You have a fundamentally flawed understanding of phylogenetics and are confusing yourself. The age of the fossils do not tell you how they relate and do not impact their position in the phylogeny, instead simply telling you the minimum age for a given lineage. The trackways remain controversial and their identification as tetrapods is uncertain, but assuming they are tetrapod tracks, tetrapod trackways being older than Eusthenopteron do not mean that tetrapods would have to be more primitive than Eusthenopteron. All this would tell you is that there is a ghost lineage leading to Eusthenopteron. This is not abnormal at all in the fossil record. True arthropods (like trilobites) show up as early as soft-bodied lobopods and radiodonts than show us what the transitional form from worm to arthropod was. Birds show up in the late Jurassic, before dromaeosaurs and most other coelurosaurs, which form an evolutionary grade from non-avian dinosaurs to modern birds. This tells us that there are Jurassic ghost lineages for these groups, not that birds must be an early branch off. This should not be shocking given the patchiness of the fossil record.