Tell this to Kishimoto himself. Let's see what will be reaction. XD
Maybe because:
1.the Tenseigan wasn't ready yet
2.Toneri feared that Kaguya may try to use MT on him too
3.Hated mankind so he didn't wanted cooparate with them
4.The moon was not close enough to teleport from there to the planet
Also, I hope you know that your "points" are just the same craps like:
1.Why didn't Obito helped to destroy the village instead of massacaring down his own clan despite his goal was to destroy Konoha
2.What happened to the mercenary army that Pain mentioned in Hidan & Kakuzu arc
3.Why didn't Obito befriended with the outcasted child Naruto and brought him from the village after getting his love
4.Why didn't Black Zetsu appeared and forced Nagato to use Rinne Tensei on the real Uchiha Madara since even the black rods are his creations
5.Why didn't Akatsuki used disguse instead of going up and down in flashy coats that everybody knows already
6.Why didn't Minato resealed the Kyuubi back into Kushina to save her life as they did later to Naruto (or just allowing to Kushina too pull back the Kyuubi back into her as she wanted) since Kushina had more stamina and life force than Naruto who fell into coma at the moment of extraction while Kushina still had tons of powers to pull jutsus even after the extraction
7.Why didn't Kabuto summoned edo tensei ninjas to aid him in his battle againts the Uchihas brothers instead of fightning alone
And so on! So, the manga is not canon neither?