Lucy and a new friend bring back an old debate

FOSSILS. Since Lucy's days (Australopithecus afarensis), the debate around the evolution of bipedalism did not stop. Now, a new specimen (3.58 myo from Ethiopia) brought our attention to the old debate. Last week, an article was published in PNAS where the authors conclude "....that bipedality in Australopithecus was highly evolved and that thoracic form differed substantially from that of either extant African ape". Some colleagues agree with that but are more careful when comparing Lucy and Big Man (new fossil) upright walking with our bipedalism and wrote that ".....they were not identical and biomechanically equivalent to people".
New fossils.....still the same old debate.