I was also wondering that, why is Minato wasting Karama's chakra just give it to Naruto already and why haven't we heard from Karama why hasn't he advised Naruto not sense the Hokage's arrival
Don't Naruto have enough power ups, the guy is half Uzumaki, half Senju, have Sage Mode chakra and have 9 tail steriods injection, now you want him to get 9 tail HGH pills from Minato(I see you want Naruto to become a big living chakra ball, by using Super tail sage Juubi mode jutsu). How about Naruto learn some new techniques(like his other element jutsu), to go along with his already power up cheat jutsu using self, before you give him another power up(How about giving Naruto E.M.S, Rinnagan and the 10 tail Juubi why you at it). God I don't think the real Sage of the 6 path needed to become 20 Tail Dragon Phoenix Jinchuuriki to fight 10 Tail Juubi. No he already had enough chakra to pull off jutsu techniques to defeat the Juubi over powering chakra(like Minato and the first Hokage did against the 9 tail Fox).
Kishi stop giving these bum's like Tobi Obito Uchiha and Naruto tail beast to help them get pass Kage level and surpass all time great ninja. I like to see ninja like Minato & Madara get tail beast power as Jinchuuriki or just controlling it, I wish we could of seen Itachi, Nagato, Kakashi, Sasuke, Oroachimaru, Pervy Sage, Shikamaru and the other 3 Edo Hokage become Jinchuuriki for any tail beast(even the weakest one and they all would be and would of been unstoppable).