mokuton and outer path take skills to be useful the reason they were so op is because pain and hashi used them their entire life
Madara taught obito how to use rikudou's jutsu (rinnegan). His outer path was
stated to be better than nagato's. He had absolutely no excuse to hold back human path
Mokuton doesnt require skill to master either, just look at madara with his first time using it, he created a forest in an instant. Obito can spawn mokuton from his arm, why did he not utilize it better during the battle??
and jinchuuriki paths weren't his it was a fair 1v1 fight no tricks or nothing and he lost
The jinchuuriki paths are his whether you think so or not. Obito has all the components to make the paths for himself. The only thing that kabuto did was give the paths immprtality. Obito provided everything else.
& you are 100% wrong to say that "it was a fair fight", obito was restricted of his
best move, kamui. The only way to make it a
fair 1v1 would be if you gave them equal footing in the real world, with
no restrictions. Obito had multiple restrictions, case closed...