Yes, that's why I looked it up, then finding it, posted it. It is apparently not as you claimed earlier.
I freely admit many lexicons ascribe a meaning of authority to kephalé, including Strong's, Thayer, and BAGD. But I don't believe those are correct. BAGD does so on the thinnest of evidence, the Bible itself and a reference from several centuries later, when kephalé did come to refer to authority. But in the first century, not so much. And the Septuagint is very powerful testimony to that fact.
Here is the Liddell Scott Jones, the premier lexicon of ancient Greek. You will not find a reference to authority listed here at all:
κεφᾰλή, ἡ, head of man or beast, Hom. (v.infr.), Alc.15, etc.; once in A., Th.525 (lyr.), once in S., Aj.238 (anap.), also in E., Fr.308 (anap.), Rh.226 (lyr.), al.; ἄλλου οὐδενὸς ἐμψύχου κ. γεύσεται Αἰγυπτίων οὐδείς Hdt.2.39; κεφαλῇ . . μείζονες taller in stature, Il.3.168; so μείων . . κεφαλήν ib.193 Aristarch.: freq. with Preps.,a. κατὰ κεφαλῆς, Ep. κὰκ κεφαλῆς, down over the head, κόνιν . . χεύατο κὰκ κεφαλῆς Il.18.24, cf. Od.8.85, etc.b. κατὰ κεφαλήν, Ep. κὰκ κεφαλήν on the head, Ἐρύλαον . . βάλε πέτρῳ μέσσην κὰκ κεφαλήν Il.16.412, cf. 20.387, 475: in Prose, from above, X.HG7.2.8: c.gen., above, κ. κ. τινῶν γενέσθαι ib.7.2.11; τὸ κ. κ. ὕδωρ, of rain water, Thphr. HP4.10.7 (-ὴν codd.), CP6.18.10 (-ῆς): in Archit., upright, IG22.463.42; also, per head, each person (cf. infr. I.2), Arist.Pol.1272a14, LXX Ex.16.16; κατὰ κεφαλὴν τῶν κωμητῶν PPetr.2p.17 (iii B. C.).c. ἐς πόδας ἐκ κεφαλῆς from head to foot, Il.23.169; τὰ πράγματα ἐκ τῶν ποδῶν ἐς τὴν κ. σοι πάντ’ ἐρῶ Ar.Pl.650.d. ἐπὶ κεφαλήν head foremost, ἐπὶ κ. κατορύξαι to bury head downwards, Hdt.3.35; ἐπὶ κ. ὠθέεσθαι to be thrust headlong, Id.7.136, cf. Hyp.Fr.251; ἐπὶ κ. ὠθεῖν τινα ἐκ τοῦ θρόνου Pl.R.553b; ἐπὶ τὴν κ. εἰς κόρακας ὦσον Men.Sam. 138; εὐθὺς ἐπὶ κ. εἰς τὸ δικαστήριον βαδίζειν D.42.12; οὐ βουλόμενος πολίτας ἄνδρας ἐπὶ κ. εἰσπράττειν τὸν μισθόν recklessly, Hyp.Lyc.17; ἐπὶ ταῖς κεφαλαῖς περιφέρειν carry on high, in token of admiration, Pl. R.600d.2. as the noblest part, periphr. for the whole person, πολλὰς ἰφθίμους κ. Il.11.55, cf. Od.1.343, etc.; ἶσον ἐμῇ κ. no less than myself, Il.18.82; ἑᾷ κ. Pi.O.7.67; esp. in salutation, φίλη κ. Il.8.281, cf. 18.114; ἠθείη κ. 23.94; Ἄπολλον, ὦ δία κ. E.Rh.226 (lyr.): in Prose, Φαῖδρε, φίλη κ. Pl.Phdr.264a; τῆς θείας κ. Jul.Or. 7.212a: in bad sense, ὦ κακαὶ κεφαλαί Hdt.3.29; ὦ μιαρὰ κ. Ar.Ach. 285: periphr. in Prose, πεντακοσίας κεφαλὰς τῶν Ξέρξεω πολεμίων Hdt.9.99: in bad sense, ἡ μιαρὰ καὶ ἀναιδὴς αὕτη κ. D.21.117, cf. 18.153; ἡ κ. τῶν αὐτοῦ PRein.57.8 (iv A.D.); μεγάλη κ. a great personage, Vett. Val.74.7; cf. supr. I b fin.3. life, ἐμῇ κ. περιδείδια Il.17.242; σύν τε μεγάλῳ ἀπέτεισαν, σὺν σφῇσιν κεφαλῇσι 4.162; παρθέμενοι κεφαλάς staking their heads on the cast, Od.2.237; τὴν κ. ἀποβαλέεις Hdt.8.65.4. in imprecations, ἐς κεφαλὴν τράποιτ’ ἐμοί on my head be it! Ar.Ach.833; ἐς τὴν κ. ἅπαντα τὴν σὴν τρέψεται Id.Nu.40; ἃ σοὶ καὶ τοῖς σοῖς οἱ θεοὶ τρέψειαν εἰς κ. D.18.290; ἐς κ. σοί (sc. τράποιτο) Ar.Pax1063, Pl.526; σοὶ εἰς κ. Pl.Euthd.283e; τὰ μὲν πρότερον . . ἐγὼ κεφαλῇ ἀναμάξας φέρω Hdt.1.155; οἷς ἂν . . τὴν αἰτίαν ἐπὶ τὴν κ. ἀναθεῖεν D.18.294; τὸ αἷμα ὑμῶν ἐπὶ τὴν κ. ὑμῶν Act.Ap. 18.6.II. of things, extremity,a. in Botany, κ. σκορόδου head ( = inflorescence) of garlic, Ar.Pl.718, cf. Plb.12.6.4; κ. μήκωνος Thphr.HP9.8.2; ῥίζα κ. ἔχουσα πλείονας tubers, Dsc.3.120.b. in Anatomy, κεφαλαὶ τῆς κάτω γνάθου, prob. the condyloid and coronoid processes, Hp.Art.30; ἡ κ. τοῦ ὄρχεως, = ἐπιδιδυμίς, Arist.HA510a14, cf. Gal.4.565; μηροῦ, κνήμης κ., Poll.2.186, 188; of the base of the heart, Gal.UP6.16; but, apex, Hp.Cord.7; of the sac in poulps, Arist.PA654a23, 685a5; of muscles, origin, Gal.UP7.14.c. generally, top, brim of a vessel, Theoc.8.87; coping of a wall, X.Cyr.3.3.68; capital of a column, CIG2782.31 (Aphrodisias), LXX 3 Ki.7.16, Poll.7.121.d. in pl., source of a river, Hdt.4.91 (but sg., mouth, οἶδα Γέλα ποταμοῦ κεφαλῇ ἐπικείμενον ἄστυ Call.Aet.Oxy.2080.48): generally, source, origin, Ζεὺς κ. (v.l. ἀρχή), Ζεὺς μέσσα, Διὸς δ’ ἒκ πάντα τελεῖται (τέτυκται codd.) Orph.Fr.21a; starting-point, κ. χρόνου Placit. 2.32.2 (κρόνου codd.), Lyd.Mens.3.4; κ. μηνός ib.12.e. extremity of a plot of land, PPetr.3p.72 (iii B.C.), PFlor.50.83 (iii A.D.).III. Ὁμηρείη κ. bust of Homer, IG14.1183.10.IV. κ. περίθετος wig, head-dress, Ar.Th.258.V. metaph., κ. δείπνου pièce de résistance, Alex. 172.15.2. crown, completion, κεφαλὴν ἐπιθεῖναι Pl.Ti.69b; ὥσπερ κ. ἀποδοῦναι τοῖς εἰρημένοις Id.Phlb.66d, cf. Grg.505d; ὥσπερ κεφαλὴν ἔχουσα ἐπιστήμη Arist.EN1141a19; consummation, σχεῖν κ. Pl.Ti.39d.3. sum, total, πάσας ἐρρηγείας Tab.Heracl.1.36; of money, IG12(9).7 (Carystus, iv B. C.), SIG245ii 36 (Delph., iv B. C.).4. band of men, LXX Jb.1.17; right-hand half of a phalanx (opp. οὐρά), Arr.Tact.8.3, Ael.Tact.7.3.5. Astron., κ. τοῦ κόσμου, of Aries, Heph.Astr.1.1. (ghebh-, cf. κεβλή and Engl. gable.)